packaging: setup: configuring cluster CPU type only on the first host

No need to reconfigure the cluster CPU type for each additional host

Change-Id: I82916788b8e2582bbf3bebc3c285e1833b7678ad
Bug-Url: https://bugzilla.redhat.com/1086032
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>