Adds methods in version.py for proper oslo_reports setup
Adds methods in version.py for proper oslo_reports setup

The current implementation not provide useful information, such as a version
info to Guru Meditation report. This fix adds additional methods to version.py
that provide general information about used octavia package.

Change-Id: If546c4f737bcdd5575f57805762480bdcd590064
Closes-Bug: #1589858

openstack/octavia,openstack/octavia,openstack/octavia