Added get_subnets to the Router PortData Class This will enable to get a list of subnets configured for this port
Added get_subnets to the Router PortData Class
This will enable to get a list of subnets configured for this port

Change-Id: I0d2a08f0636c70a15d4106c03ce9d61a982c8f75

neoareslinux/dragonflow,no2key/dragonflow,FrankDuan/df_code,no2key/dragonflow,FrankDuan/df_code,openstack/dragonflow,neoareslinux/dragonflow,FrankDuan/df_code,openstack/dragonflow,openstack/dragonflow