Change the update_local_port_num method to be private method
Change the update_local_port_num method to be private method

Change-Id: Iacbf68075e018fea1aecc6ef1b717efb75c22f48

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