* Upon deactivation of floating ip and service vlan, release the
  reference to vrf, so that vrf deletion can proceed.
* Test case for same
Closes-bug: #1359320

Change-Id: Ib68d8696f4cae795da3c2b170c6366705c5e835e
Merge "* Upon deactivation of floating ip and service vlan, release the   reference to vrf, so that vrf deletion can proceed. * Test case for same Closes-bug: #1359320"