* 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: I93dac29a1e3c25ba963a2586f084506d135b1f1e
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" into R1.10