core: allow using cloud init only from 3.3

since cloud init uses new vdsm capability to set cd volume name,
it is supported only from 3.3
add check in canDoAction to enforce this.

Change-Id: I88d4ba3ca4dc24bdd3c12aeaf8168683e60096d9
Signed-off-by: Omer Frenkel <ofrenkel@redhat.com>