engine: moving VM with empty nic to unsupported cluster should be blocked

When moving VM with empty nic (no network) from cluster 3.2 to cluster 3.1
the VM have nic without network on cluster 3.1.
This patch blocks it by canDoAction.

Change-Id: Ic94c4b06b42675e4c5fe28317b38a3590d8fbe79
Bug-Url: https://bugzilla.redhat.com/909834
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>