Fix up some docstrings.
Fix up some docstrings.

The version.py docstrings were a) not PEP compliant and b) somewhat
out of sync with the code.

Change-Id: I87c4134ef80fd9e6fd57b66c58c3c5920ee0b6b6

JioCloud/pbr,JioCloud/pbr,redhat-openstack/pbr,openstack-dev/pbr,WiFast/pbr,varunarya10/pbr,varunarya10/pbr,klmitch/pbr,WiFast/pbr,klmitch/pbr,redhat-openstack/pbr,openstack-dev/pbr,openstack-dev/pbr