Add repository glance.store to glance

According to the mail '[openstack-dev] [Glance] glance.store repo created'
written by 'Flavio Percoco flavio at redhat.com' at 'Thu Jul 17 06:42:01 UTC 2014'
( http://lists.openstack.org/pipermail/openstack-dev/2014-July/040519.html )
code related to stores is now available in the repository openstack/glance.store.

Change-Id: I166a954773a0a8989bae72db7ce826af6112376d
Merge "Add repository glance.store to glance"