Backwards compatible selinux dep fix for EL7/F20

https://fedoraproject.org/wiki/SELinux_Policy_Modules_Packaging_Draft#Runtime_Dependencies
https://bugzilla.redhat.com/show_bug.cgi?id=999584
Merge pull request #599 from jmontleon/master

Backwards compatible selinux dep fix for EL7/F20