Updated openstack/openstack
Project: openstack-dev/devstack  2b9acae9f215b25fe48eeca0de6d02464d207f48

Test against latest glance_store code

Install glance_store from git so we can test Glance against master. This
is useful for both, glance and glance_store gates, to make sure nothing
is broken there.

Change-Id: I6c01165c4384c41f46f2c32d64475703b3178dab