Add update QoS rule test step to fip-qos scenario

This test step was performed at QoSTest.test_qos_basic_and_update (QoS
policies applied to network and port), but not at
FloatingIPQosTest.test_qos (QoS policies applied to FIP)

Change-Id: I4c714f68150f4e40d09048e4d2306619455875b4
1 file changed