Updated openstack/openstack
Project: openstack-infra/devstack-gate  6437518ac27f3c680bc5b28a2996ac615b5674ff

Increase CEPH_LOOPBACK_DISK_SIZE for ceph

check-tempest-dsvm-full-ceph is failing due to space
contraints in the Ceph store.  Increase the size of this
store to alleviate this problem.

Change-Id: I753cee181b7a4e4de36840407f9cfbaafc4802a6