glance-manage wont take version into consideration

A glance-manage db upgrade/db downgrade will do either an 'upgrade to
latest' or 'downgrade to None' even though a version argument is
provided. The version being passed isn't being picked up and None is
passed across.

Fixes bug 1258068
Change-Id: Iaab4cf5eeb6d7c9c94fc741841a6b0797a058d40
Merge "glance-manage wont take version into consideration"