This (big) patch reworks the master startup/shutdown and the fixes the
master failover.

What does the patch do?

For master start/stop:
  - remove the old ganeti-master script and its associated man page
  - moves the ip start/stop directly into the backend.(Start|Stop)Master
  - adds start/stop of the master/rapi daemon into these functions,
    selectively based on the start/stop arguments
  - makes the master call via rpc StartMaster(start_daemons=False) to
    the local node so that the master IP is started
  - and finally changes the example init.d script to directly start and
    stop all three daemons, since they do the right thing (depending on
    master/not master role)

For master failover:
  - moves the code from LUMasterFailover into bootstrap.MasterFailover,
    since we need to start/stop the master during this operation and
    thus it can't be executed from the master
  - removes the LUMasterFailover and its associated opcode

Notes: ubuntu's /etc/lsb-base-logging.sh is dumb, so the messages 'not
master' are not seen during startup on non-master nodes.

Reviewed-by: ultrotter

Reviewed-by: ultrotter

The old API is no longer working.

Reviewed-by: ultrotter

Reviewed-by: iustinp

Reviewed-by: iustinp

I broke gnt-backup in rev 1035, sorry :(

Reviewed-by: imsnah

"gnt-job list" was broken after my recent changes in the RPC
between clients and the master. This patch makes it work again.

Reviewed-by: iustinp

The gnt-instance script doesn't run in the same process anymore, so we
can't and don't have to unlock.

Reviewed-by: ultrotter

This adds the same “-o +...” functionality in gnt-job as in the node and
instance scripts.

Reviewed-by: imsnah

From the master node we can't start ssh and connect to the remote node,
nor we can do it from ganeti-noded as this ssh section will possibly ask
for key confirmation and password. So the code to copy the ganeti-noded
password and SSL key has been moved to bootstrap.py, and it's called by
gnt-node before the AddNode opcode.

Reviewed-by: iustinp

In the "new world" we'll need to setup ganeti-noded via ssh on the node
before calling the AddNode opcode. Before doing it we'll check that the
node is not already in the cluster, if --readd was not passed. This
guarantees we're not going to restart ganeti-noded on a running node.

This patch also incidentally fixes a non-style-guide conformant
docstring.

Reviewed-by: iustinp

Apparently there were still some leftovers. While removing an instance,
I got the message "unhandled exception 'module' object has no attribute
'LD_MD_R1'".

Reviewed-by: iustinp

Since the disabling of forking in the master daemon, the two ssh-based
subcommands were not working anymore. However, there is no need at all
for the commands to be run from the master daemon (permissions to read
the cluster private ssh key notwithstanding), they can be run directly
from the command line utilities.

The patch removes the two opcodes OpRunClusterCommand and
OpClusterCopyFile (and their associated LUs) and changes the code in
‘gnt-cluster’ to query the list of nodes and run directly the SshRunner
over the list. As such, all forking is done from the gnt-cluster script,
and the commands are working again.

Reviewed-by: imsnah

Currently there isn't any easy way to list all nodes or instance and
their tags; you have to query each node in turn, or list all the tags
via something like “gnt-cluster search-tags '.*'”. Of course, this is
not optimal.

The patch adds a new fields to “gnt-instance list” and “gnt-node list”
called ‘tags’, that will list the tags of the object in comma-separated
form. This field will be empty if there are no tags (when using a
separator this output can still be parsed by other scripts).

At opcode level, there is a new fields called ‘tags’ that returns a
(python) list of the object tags.

Reviewed-by: ultrotter

This change allows us to use cleaner dependencies between
directories. The build system is basically rewritten in large parts
and may contain bugs.

Reviewed-by: iustinp

This patch exposes at command line level the grow-disk operation.

Reviewed-by: imsnah

This allows us to initialize a new cluster. The code certainly contains
bugs and hooks aren't implemented yet.

Reviewed-by: iustinp

Author: schreiberal
Reviewed-by: iustinp

Another tiny fix. Anybody got a nice brown paper bag I can wear?

Author: schreiberal
Reviewed-by: iustinp

This patch modifies the code for "gnt-instance info .." to only display
instance parameters that actually apply to that instance, i.e. for PVM
instances no HVM parameters are shown and vice versa.

Author: schreiberal
Reviewed-by: iustinp

This patch adds the commandline extensions and the code to store
and display the extended HVM features.

Author: schreiberal
Reviewed-by: iustinp

This patch removes the last of the md and drbd 0.7 code. Cluster which
have the old device types will be broken if they have this applied.

Reviewed-by: imsnah

Reviewed-by: ultrotter

[Trunk version]

Reviwed-by: imsnah

This reverts commit 976.

Reviewed-by: ultrotter

[Forward-port of the 1.2 branch patch]

This patch removes all the parameters and options from the output
"gnt-X" (i.e. the subcommand list for command). This is done in order to
uniformize the output, currently only some parameters are shown and they
are not always consistent (e.g. required versus important parameters).

Reviewed-by: ultrotter

This shortens the help output in gnt-node so that the output looks
nicer, and improves the manual page for gnt-instance with the new
'status' field.

Reviewed-by: ultrotter

This patch allows the '-o' option to the list subcommands to add more
fields to the default list instead of replacing the default list by
prefixing the fields list with '+'.

The patch also moves the listing (in the help output) of the default
field list from hardcoded to built at runtime from the actual list.

Reviewed-by: ultrotter

This patch adds the backend and frontend changes needed for being able
to list the cpu count.

Reviewed-by: ultrotter

This patch adds the file storage options to gnt-backup import which
would otherwise fail since the values of file_storage_dir and
file_driver are accessed in LUCreateInstance.

Reviewed-by: ultrotter

bdev.FileStorage does not have major or minor fields, so gnt-instance
info for file backed instances fails with a TypeError. This patch
adds checks to prevent that and print 'N/A' instead.

Reviewed-by: imsnah

This patch implements secondary replace via the iallocator. The new
opcode parameter 'iallocator' behaves like this: if passed, it will
always compute and assign a new secondary, behaving in effect as if the
secondary node has been passed. It conflicts with actually giving the
secondary too.

[Note: not tested with remote_raid1, but the code should behave the
same, we only touch CheckPrereq and we assign a node.]

The patch also adds burnin support for the replace secondary operation;
with this in place, burnin can fully work with auto-assigned nodes.

Reviewed-by: ultrotter

This patch also fixes the LUExportInstance Prereq docstring.

Reviewed-by: iustinp

This allows us to readd a node after it failed and required a
reinstallation or replacement.

Reviewed-by: iustinp

Reviewed-by: amishchenko

This (final) patch allows the instance's nodes to be selected
automatically based on the passed allocator algorithm.

The patch changes the pnode opcode parameter from required to optional,
now either the pnode or the iallocator must be passed.

A possible improvement could be to organize all the _IAllocator
functions into a separate class, but that can come later and the current
version is functionally ok.

Reviewed-by: ultrotter

In preparation for the introduction of automatic instance allocator,
this patch adds an allocator simulation opcode, that based on the input
parameters, will return either the input message to the allocator
(implemented) or the result of the allocator run (not yet implemented).

This allows algorithm tests against simulated allocations and the
current cluster state.

The patch adds the following:
  - a function that generates the generic cluster information for the
    allocator
  - a function that generates the 'new instance' information
  - a function that generates the 'replace_secondary' information

These three functions will be used by the allocator framework later to
generate the actual information for the external algorithms. Currently
we just return the json-serialized text.

Reviewed-by: imsnah

Add a general way to skip some checks at cluster-verify time and make the N+1
memory redundancy check optional.

Reviewed-by: iustinp

Currently, the opcode DiagnoseOS is the only opcode that return a
structure of objects.OS (which is a custom class, and not a simple
python object) and furthermore all the processing of OS validity across
nodes is left to the clients of this opcode.

It would be more logical to have this opcode be similar to list
instances/nodes, in the sense that:
  - it should return a table of results
  - the fields in the table should be selectable

This patch does the above. The possible fields are:
  - name (os name)
  - valid (bool representing validity across all nodes)
  - node_status, which is a complicated structure required for ‘gnt-os
    diagnose’

With this patch, gnt-os list becomes a very simple iteration over the
list of results, filtering out non-valid ones. gnt-os diagnose is still
complicated, but no more than before.

The burnin tool has also been modified to work with the modified
results, and is simpler because of this (it only needs to know if an OS
is valid or not, not the per-node details).

Reviewed-by: imsnah

This patch enhances gnt-debug to be able to submit any opcodes. The
opcodes are input from a json file containing a list of opcodes.

This allows enhanced testing of opcodes until the other gnt-* commands
are converted to use the master daemon.

Reviewed-by: ultrotter