Currently, the vip of lbaasV2 will not have l3 network with DVR.
This prevent the usercase of lbaasV2 + DVR. This patch aims to
enable servicing lbaasv2 vip by DVR.
Change-Id: I1b51550437994fbe78d4db904641d4d9fb75d82e
Closes-Bug: #1493809
(cherry picked from commit a57b37fc56)