packaging: setup: Do not enable Gluster in Default cluster

DEFAULT cluster is created during installation of engine.
If Application mode is selected as BOTH during installation,
DEFAULT cluster will be created with both Gluster and Virt enabled
by default.

By default only virt will be enabled in DEFAULT cluster.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=988453
Change-Id: Ic8b4d15689c730428aad09dd0c981faf5732731d
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>