Fix identity test_role functional tests

A recent keystone change [1] resulted in the domain_id field
being included when showing a role.

[1] openstack/keystone@407eabd

Change-Id: I344f4d727f2a16217c075ad8b8393c1e0a233c2e
Closes-Bug: #1544547

Author: rtheis

functional/tests/identity/v2/test_identity.py

@@ -24,7 +24,7 @@ class IdentityTests(test.TestCase):
                    'username', 'domain_id', 'default_project_id']
     PROJECT_FIELDS = ['enabled', 'id', 'name', 'description', 'domain_id']
     TOKEN_FIELDS = ['expires', 'id', 'project_id', 'user_id']
-    ROLE_FIELDS = ['id', 'name', 'links']
+    ROLE_FIELDS = ['id', 'name', 'links', 'domain_id']
     SERVICE_FIELDS = ['id', 'enabled', 'name', 'type', 'description']
     ENDPOINT_FIELDS = ['id', 'region', 'service_id', 'service_name',
                        'service_type', 'enabled', 'publicurl',

functional/tests/identity/v3/test_identity.py

@@ -30,7 +30,7 @@ class IdentityTests(test.TestCase):
                    'domain_id', 'default_project_id', 'description']
     PROJECT_FIELDS = ['description', 'id', 'domain_id', 'is_domain',
                       'enabled', 'name', 'parent_id', 'links']
-    ROLE_FIELDS = ['id', 'name', 'links']
+    ROLE_FIELDS = ['id', 'name', 'links', 'domain_id']
     SERVICE_FIELDS = ['id', 'enabled', 'name', 'type', 'description']
     REGION_FIELDS = ['description', 'enabled', 'parent_region', 'region']
     ENDPOINT_FIELDS = ['id', 'region', 'region_id', 'service_id',