Add OpenAPI annotations for rrules and settings

Added some missing OpenAPI annotations for rrule and settings. Not sure if that's intended or the right way - please check.

(and it reverts commit 789cf19c which was just used for testing the merge policies)

program/tests/test_hosts.py

@@ -68,7 +68,6 @@ def test_retrieve_host(api_client, host):
     assert response.status_code == 200
 
 
-@pytest.mark.skip
 def test_update_host(admin_api_client, host, image):
     update = host_data(image)
     update["is_active"] = False

[Chris Pastl]

Test succeeds - so removed skip mark