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'm curious what the motivation of making this a subpackage instead of it's own package was?