Add api version detection to verify_tempest_config

This commit adds glance api version discovery to
verify_tempest_config.py. It will query the glance API to see which
API versions are available and then compare that to what is in the
config, pointing out any differences

Partially Implements: blueprint config-verification

Change-Id: Ie75f7f526d78b85a53ea4b0484e670d373d622ec
1 file changed