Fix compatibility with Tempest

Change [1] fixed gates but introduced incompatible code for
scenario tests. So, fix its compatibility for used version of tempest.

[1] Id7d43dee256856062bd0dadad9c469c1500ee36e

Change-Id: I4c3d9df0de6908b82aca787ab124552796cd1066
Closes-Bug: #1555218
1 file changed
tree: a8c5fec62a72119bdc3cd4c1fd7ec91bca5ef9ac
  1. manila_tempest_tests/