Allow loading of product/vendor/package info from external file

Currently the version.py file hardcodes some basic info for
the NOVA_PRODUCT, NOVA_VENDOR and NOVA_PACKAGE constants. It
is desirable that OS distro vendors can override/extend this
data in packages they ship. Cloud providers may also desire
to do the same. This allows Nova to optionally load this
data from a /etc/nova/release file. That file should contain
the data in a trivial "ini" format. For example:

  [Nova]
  vendor = Fedora Project
  package = 1.fc18

Note that vendor sare not required to override all strings.
In this example, the 'product' field is not set, leaving
it on the default 'OpenStack Nova' value.

Change-Id: I3d8d32eaf35268c4b0908b0a93b7c9a2ea9c580a
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

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