Install openstack-selinux on RHEL

The openstack-selinux package contains policy updates for OpenStack.
Updates are accrued in openstack-selinux before they are merged into
the upstream selinux-policy package.

Change-Id: I7c00e5cae17489202fe7aee3e656fca27ab630ba
Merge "Install openstack-selinux on RHEL"