packaging: setup: Use common code for remote engine pki

Requires http://gerrit.ovirt.org/33023

Bug-Url: https://bugzilla.redhat.com/1142267
Change-Id: Ia7a549d09dc85293beba24327ea44ef1dcaf4a55
Signed-off-by: Yedidyah Bar David <didi@redhat.com>