ConversationWrapper get_opted_in_addresses and get_opted_in_contacts are being skipped

```
$ trial go/vumitools/conversation/tests/test_utils.py
go.vumitools.conversation.tests.test_utils
  ConversationWrapperTestCase

    test_get_opted_in_addresses ...                                  [SKIPPED]
    test_get_opted_in_contacts ...                                    [SKIPPED]

[SKIPPED]
Waiting for API to stabilize
```