Fix obsolete imports in functional tests
Fix obsolete imports in functional tests

isolated_creds was renamed to dynamic_creds in murano functional
tests. Also, update class names.

Change-Id: I3596a80925dde388dcb69a37ee4fd0343849b352
Closes-Bug: #1504508

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