Bringing yumpkg back!

This was moved off to salt-contrib due to some issues with SELinux. I've added in a grain for SELinux (as a bunch of other thinks may or may not work with it) and have made yumpkg the default for all redhat family OSs with selinux disabled (might want to change to non-enforcing, but we'll start out safe)
Update grain to load only if you have the required binaries

Change yumpkg to only load on RHEL 6 releases
Update grains (typo) and remove trailing whitepsace in yumpkg.py
Remove unecessary access
Merge pull request #9756 from jacksontj/develop

Bringing yumpkg back!