BZ #1109311 - Re-add openstack-selinux to deployment

https://bugzilla.redhat.com/show_bug.cgi?id=1109311

Openstack-selinux will be used in RHEL 7 after all.
Merge pull request #267 from jguiditta/bz1109311_os_selinux

BZ #1109311 - Re-add openstack-selinux to deployment