Delete identity domain must delete its contents

This patch enables a test to make sure the domain contents are deleted
when a domain is deleted.

Related-Bug: #1718747
Depends-On: If5bdb6f5eef80b50b000aed5188ce7da4dfd1083

Change-Id: Ibeb645870a070b0a226ffa7b99327beddfec5ec5
diff --git a/tempest/api/identity/admin/v3/test_domains.py b/tempest/api/identity/admin/v3/test_domains.py
index 2b4d28e..8a39a44 100644
--- a/tempest/api/identity/admin/v3/test_domains.py
+++ b/tempest/api/identity/admin/v3/test_domains.py
@@ -130,7 +130,6 @@
         self.assertNotIn(domain['id'], domains_list)
 
     @decorators.idempotent_id('d8d318b7-d1b3-4c37-94c5-3c5ba0b121ea')
-    @decorators.skip_because(bug='1718747')
     def test_domain_delete_cascades_content(self):
         # Create a domain with a user and a group in it
         domain = self.setup_test_domain()