Fix NovaObject versioning attribute usage

A typo made early in the object prototyping process has meant that
all objects thus far have been exposing a version of '1.0' because
the base object has been using an attribute of 'version'. The
object implementations have been exposing a 'VERSION' attribute
with their desired version advertisement.

Since we are still relatively early in the process of deploying
objects, the impact from this should be relatively minor, although
it is important to get this fixed ASAP before any incompatible
object changes are made.

Change-Id: If9154dc663111f304f72ef7f6f37c465e84ff504
Closes-bug: #1239709
Merge "Fix NovaObject versioning attribute usage"
xenapi: post install scriptlet to rpm

A freshly installed XenServer requires some modifications in order to be
able to run OpenStack. Nova contains an rpm specification to create a
package with the dom0 plugins, however installing the rpm is not enough.
Some more actions need to be taken:
 - create /images, link to a directory within the local SR
 - setup an ssh keypair, and authenticate it with the host
This change adds a post script to the nova plugins rpm spec file, so
by installing the rpm on a XenServer, it is ready to run OpenStack, no
further manual actions needed.

Change-Id: Id57e3a3ab2782550468c6aa4c01059ceb7cc81ab