In the event that there are multiple RPs available from different
computes, the current logic has a chance to grab an RP associated with
an underlying resource and get the incorrect hostname e.g.
edpm-compute-0.ctlplane.example.com_0000:00:1A.0 instead of just
edpm-compute-0.ctlplane.example.com, this change only uses the parent RP
to avoid using other resources.
Change-Id: I6d7f47cfbf72e316be74863f49abe510243ee0cc
Signed-off-by: jamepark4 <jparker@redhat.com>