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.
I wanted it associated with the node directory tree and it seemed odd to create a spec file in a subdirectory of a directory that already had a spec file. Tito may have some hangups with it as well.

The other option I can see is moving tune-profiles into the root of the repo. If we were to create profiles for other roles that would probably make the most sense. However, I foresee no need for additional profiles at this time.