core: cluster dao test

Fix regression in cluster dao test from
I5847d234e396fe8a83017fb25a5139f552e7c61b

Change-Id: I4fbe12608ddf6e305d05cb869890e9e2ba018e24
Bug-Url: https://bugzilla.redhat.com/784521
Signed-off-by: Greg Padgett <gpadgett@redhat.com>
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>