On deactivation of L2, vxlan id in vm interface gets reset.
On activation retrieve it from VN if l2 is active.

https://bugs.launchpad.net/bugs/1356716

Change-Id: Iedf2abf6a24e228b51be58d9c2196a0025858aa5
Merge "On deactivation of L2, vxlan id in vm interface gets reset. On activation retrieve it from VN if l2 is active." into R1.10