Fix port IP update
Fix port IP update

Add IP update on port update and fetch the IPs correctly.

Change-Id: I4ce7ecab51bf615df4584820d6107271d84278fb

openstack/dragonflow,openstack/dragonflow,FrankDuan/df_code,FrankDuan/df_code,openstack/dragonflow,FrankDuan/df_code