Updated openstack/openstack
Project: openstack-dev/devstack  5d7c7ac42556e03960a5a6549c3e07c34d36b9c0
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Add RHEL7 beta support

RHEL7 still in beta status, so it will require the FORCE option,
until the GA release.

The main notable difference from another RHEL family members, it does
not have the mysql alias for the mariadb.

Change-Id: Ic90bb6c3dd9447fc80453c3dc1adb22cdfc6226f