Updated unit test and changelog

CHANGELOG.rst

 Changelog
 =========
 
+Version 2021.04.06
+------------------
+
+- Validate group names (INFRA-3135)
+- Add warning text for creating vm (INFRA-3292)
+- Paginate history in ansible groups and hosts (INFRA-3136)
+
 Version 2020.11.25
 ------------------
 

tests/functional/test_api.py

@@ -1568,7 +1568,7 @@ def test_create_ansible_group(client, admin_token):
     response = post(client, f"{API_URL}/network/groups", data=data, token=admin_token)
     check_response_message(
         response,
-        "(psycopg2.errors.UniqueViolation) duplicate key value violates unique constraint",
+        "Group name matches an existing group",
         422,
     )