engine: Restrict vlan-id range to 0-4094

VDSM restricts vlan-id range to 0-4094 due to Linux limitation.
The engine should be aligned with VDSM with this matter.

Change-Id: I6d22b7d4a8b8482c9d844d8a29a13590c3e2a9cd
Bug-Url: https://bugzilla.redhat.com/880254
Signed-off-by: Moti Asayag <masayag@redhat.com>