add unit test for parsing valid IPv6 route
add unit test for parsing valid IPv6 route

Change-Id: Id8101d367884497c24f8438b601539dab377d66f

openstack/akanda-appliance,openstack/akanda-appliance,dreamhost/akanda-appliance,stackforge/akanda-appliance,dreamhost/akanda-appliance,stackforge/akanda-appliance