Fix tempest compatibility

Manila's cli tempest test 'test_manila_fake_action', located in
contrib/tempest/tempest/cli/simple_read_only/test_manila.py
fails due to incompatibility affected by Tempest commit:
https://github.com/openstack/tempest/commit/aeb5274fd4f4c3658c14d44af7d02ccd907501e0

this change fixes mentioned test to be compatible with current Tempest
master branch state.

Change-Id: I58728eaa7213492b3860430d51819cd870a90fd0
Merge "Fix tempest compatibility"