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Reviewed-by: iustinp

- Add NEWS file with major changes between versions.
- Bump RPC version number
- No longer serialize in RPC, but just convert to dict

Old Pickle based configuration files can be converted using the cfgupgrade
utility.

Reviewed-by: iustinp, ultrotter

This change allows instances of ConfigObject and its children to be
converted to and from standard python types. This will allow easier
upgrade of the configuration and use of any serialization protocol (not
only pickle).

The code is not very nice (a little too verbose, I think) but it works.
Tested on a 2-node, 3-instance cluster by doing repeated conversions and
checking consistency of results.

Reviewed-by: imsnah

It makes sense to make the TaggableObject a child of the ConfigObject,
since in this case we can derive the Instance, Node and Cluster objects
only from the TaggableObject and have a cleaner hierarchy.

For consistency child classes will have to declare their slots by adding
their parents on top.

Reviewed-by: imsnah,ultrotter

Unless we use __slots__ on all parents, we don't get the benefits that
__slots__ bring. This patch adds this attribute to the TaggableObject so
that Instances, Nodes and the Clusters behave as intended.

Reviewed-by: schreiberal,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

Reviewed-by: imsnah

This changes the raising of exceptions from:
  raise Exception, value
to
  raise Exception(value)

as the first form will be removed in python-3000 and the second form is
preferred now.

The changes also involve a few cases of changing from raising standard
exceptions and use our own ones.

The new version also fixes many pylint-generated warnings, especially in
ganeti-noded where I changed many methods to @staticmethod.

There is no functionality changed (barring any bugs).

This is only the backend part, from the command line the tags can't be
read/modified yet.

Reviewed-by: imsnah

Reason: if left ConfigWriter, nodes don't know to which cluster they belong.
This will bite us later when we'll revisit node join operation.

Cons: we lose the cluster name from the config file, which means a
standalone "cluster.data" is a little bit harder to analyze. But I have
a plan for this which will follow shortly.

Implementing this will also allow us to cleanly fix "gnt-cluster
getmaster".

Reviewed-by: imsnah

Reviewed-by: iustinp

and all users have been converted, let's remove it from the slots of the
cluster object.

Also let's move the tcpudp_port_pool to the cluster object.

Reviewed-by: imsnah

Reviewed-by: iustinp