Add router functional tests
Add router functional tests

Add functional tests for the "os router" commands.

Change-Id: I99045e6e2f548ac4206afcdb61940180e609a6bc
Partial-bug: #1519503
Partially-implements: blueprint neutron-client

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