Add SELinux Policy and Support

[dmc5179]

Create and Add an SELinux policy for the fahclient, and possibly the control and viewer applications, to support enhanced security. F@H clients are rather old and likely contain security flaws. The fahclient can run a web interface which leaves it open as an attack vector.

[dmc5179]

Initial cut at fahclient SELinux policy is here:
https://github.com/dmc5179/fah-selinux

Need to verify that policy and add tasks for installing the policy module.