Updated openstack/openstack
Project: openstack-dev/devstack  ddfbacef9fd0bd64b38674524f7829b42ed08bbd

support proposed/* branches

Provide support for named proposed branches for selection logic

This syncs the get_release_name_from_branch() function from grenade.

Change-Id: I1adabf07cdc3ea6863cd30d8b6454fb40fc20288