Updated openstack/openstack
Project: openstack-dev/devstack  6b2f26577b5384b0669ae2e0d082d7fe6a1716e9
null
Fix is_n-cell-enabled

devstack-gate just adds the n-cell to the list of enabled_services and
devstack does the rest.

Change-Id: I1d7f8d085a5f46078131f0f6f670e929ec63f805