This patch series implements the reboot command for gnt-instance. It
supports three types of reboot: soft (hypervisor reboot), hard (instance
config rebuild and reboot) and full (full instance shutdown and startup
again).

This patch contains the gnt-instance script and the man page for it.

Reviewed-by: iustinp

Reviewed-by: imsnah

This patch adds a new option to the instance removal command
"--ignore-failures" that forces the removal of the instance from the
configuration even if the removal process encounters errors.

In order to be able to do this when the remote node(s) is(are) down, we
need to restrict the execution of the instance removal hook to the
master only. I think this is a reasonable trade-off (but I'm not sure).

Reviewed-by: imsnah

This patch adds a new 'evacuate' subcommand to gnt-node. The command
will do a replace disks for all instances having that node as secondary
with the new target being the new node given.

The syntax is:
  gnt-node evacuate src_node target_node

The command by itself doesn't do any resource checks, and instead relies
on the LUFailoverInstance code to do that.

Reviewed-by: imsnah

This patch implements a simple failover command for failing over all
primary instances. This is just a batched form of gnt-instance failover.

Reviewed-by: imsnah

This patch adds a '--from' option to the {add,remove}-tags commands that
allows the command to read from a file or from stdin (when passing a
dash for the filename).

Reviewed-by: imsnah

This adds documentation on the {list,add,remove}-tags commands to the
gnt-{cluster,node,instance} man pages.

Reviewed-by: imsnah

This brings this man page in conformity to gnt-node and (partially) to
gnt-instance.

Reviewed-by: imsnah

Reviewed-by: iustinp

Thanks to Christoph Rauch for reporting the problem.

Reviewed-By: iustinp

Reviewed-by: iustinp

This patch adds a new OpCode (and corresponding LU) that implements the
cluster rename functionality.

This is done by shutting down the master role, making the needed sstore
modifications and distributing the changed files to all nodes, and then
re-enabling the master role.

The modification to the man page of gnt-cluster also moves the section
on gnt-cluster destroy in order to correct alphabetical ordering.

Reviewed-by: imsnah

This patch adds support for instance rename operation at all remaining
layers: RPC, OpCode/LU and CLI.

Reviewed-by: imsnah

This patch adds support for renaming at OS level. Because of this, we
need to bump up the version of the OS api from 4 to 5.

The patch also documents the new script interface in the
ganeti-os-interface(7) man page and adds a section on upgrading the OS
definitions to the new version.

Reviewed-by: imsnah

This is an initial version of the multi-instance start/stop, which
allows the gnt-instance startup and shutdown subcommands to work on
multiple instances at once.

The available selections are:
  - "gnt-instance startup --instance name..." which is the default, and
    if passed only one argument it behaves like the original command)
  - "gnt-instance startup --node name..." will work on all instances
    having either primary or secondary one of the passed names
  - "gnt-instance startup --primary name..." will work on all instances
    having primary node one of the passed names
  - "gnt-instance startup --secondary name..." will work on all
    instances having as secondary node one of the passed names
  - "gnt-instance startup --all" will work on all instances

This allows a simple cluster-wide shutdown or node shutdown (or
startup).

Note that this version stops at the first error - it will not try to
start the 2nd instance selected if there is a critical error with the
1st one.

Also note that this version is not faster than simply running manually
"gnt-instance shutdown NAME", because it doesn't parallelize the
shutdown/startup actions.

Reviewed-by: imsnah,roman.marxer

- Clean generated files on “make maintainer-clean”.
- Build _autoconf.py and ganeti.initd on “make all”.

Reviewed-by: iustinp

Reviewed-by: iustinp

The manpage wrongly states that the default unit for disk sizes is
gibibytes, whereas currently it's mebibytes. Fix that and also update
the '--help' output to display the default unit.

Reviewed-by: roman.marxer

- Add the command to gnt-instance.sgml

Reviewed-by: iustinp

- Create all --output options using a constant
- Put node checking code from opcodes into a single function
- Do the same for output fields

Reviewed-by: iustinp

Reviewed-by: imsnah

- Fix typo