Add port functional tests
Add port functional tests

Add functional tests for "os port" commands.

Change-Id: I162eff6abacd9ffdde369647491ae472b604c692
Depends-On: I2bea508e11290284aa64b1ab548a0bb61e7290d3
Partial-Bug: #1519909
Partially-Implements: blueprint neutron-client

dtroyer/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient,dtroyer/python-openstackclient,redhat-openstack/python-openstackclient,openstack/python-openstackclient