Add ip_restriction_policy_arn to test fixtures
Add ip_restriction_policy_arn to test fixtures

As this is provided by terraform, we need to ensure it is included, else
the tests fail.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf