packaging: setup: query cluster on attempts loop

_wait_cluster_cpu_ready queried 'cluster.get_cpu()' in a loop, but
this did not actually query the engine. So if we did not get the cpu
type on first attempt we repeatedly tried checking the same values
until timeout.

Bug-Url: https://bugzilla.redhat.com/1088572
Bug-Url: https://bugzilla.redhat.com/1084863
Change-Id: I334d7eafda68843827af3f5ceb5132aefaf73f4a
Signed-off-by: Yedidyah Bar David <didi@redhat.com>