Use murano client for getting final status of environment
Use murano client for getting final status of environment

- Use murano client in get_final_status function in tests.
- This change fix congress/mistral integration gate.

Change-Id: I9ca2946cedb0b80a9be66fca50a124aa2c6434f1
Closes-Bug: #1525874

satish-avninetworks/murano,openstack/murano,satish-avninetworks/murano,olivierlemasle/murano,NeCTAR-RC/murano,DavidPurcell/murano_temp,openstack/murano,satish-avninetworks/murano,satish-avninetworks/murano,olivierlemasle/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano,olivierlemasle/murano,olivierlemasle/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano