Make router-interface-delete work in N1kv plugin
Make router-interface-delete work in N1kv plugin

Fixes bug 1226729

Change-Id: If2c6bc544dfa45cb98d5951c99f158d49191b031

cisco-openstack/networking-cisco,Gitweijie/first_project,Gitweijie/first_project,noironetworks/networking-cisco,CiscoSystems/networking-cisco,cisco-openstack/networking-cisco,CiscoSystems/networking-cisco,hareeshpc/networking-cisco,hareeshpc/networking-cisco,nikolay-fedotov/networking-cisco,openstack/networking-cisco,openstack/networking-cisco,noironetworks/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco