* Ignore deletion of gateway vrf
  test case for same
* Upon interface delete, force resycne with empty config, so that
  flaoting ip and service vlan list are cleared
  Test case for same
* Move static vrf list to VRF table from agent structure
* One of the component NH can be NULL, ignore such component NH while changing
  encap type
* Add an API to add and delete static VRF
Merge pull request #261 from naveen-n/master

Ignore deletion of gateway VRF