Node: create tuned-profiles-openshift-node

Bug 889539 - [RFE] create tuned profile for openshift-enterprise nodes
This adds an optional subpackage named 'tuned-profiles-openshift-node' which
contains a tuned profile suitable for OpenShift Node hosts. When installed this
RPM will enable the profile starting tuned if it's not currently running.
My biggest worry with it being a subpackage is that this is technically a rubygem package and it *should* (which it doesn't currently because it needs updating) have Source0 as a .gem file and not a .tar.gz[0] where as the tuned-profiles don't have any real association with the rubygems.

I'm open to suggestion though, but it seems odd at face value.

@tdawson - any thoughts?

[0] - https://fedoraproject.org/wiki/Packaging:Ruby