engine: skip cpu checks when moving host to gluster-cluster

While moving a host from one cluster to another cluster,
cpu and architecture will be checked only if the target
cluster supports virtualization.

Change-Id: I785fce50e730743bfd3dcc28773a37e8eb33f82e
Bug-Url: https://bugzilla.redhat.com/1106459
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>