Adding an option to subscribe to RHEL beta repositories

https://bugzilla.redhat.com/show_bug.cgi?id=910210

Change-Id: I4e1e4356eb9a78cdc87d9687f9be41e22b28b85b
Removing the verison in the epel-release installed

This was hard coded to epel-release-6-8
https://bugzilla.redhat.com/show_bug.cgi?id=910211

Change-Id: I42824baab2f0dc86b64bfa9b95825edca9f2fc0c
Fixing exported classes in exceptions.py

Change-Id: I6f57b76a9c5def0bceea260a9d1360e69b653a2d
Merge "Adding an option to subscribe to RHEL beta repositories" into folsom
Merge "Removing the verison in the epel-release installed" into folsom
Merge "Fixing exported classes in exceptions.py" into folsom