Update api.messages.feature, use box instead of direction/status, refs T189

Test Plan:
```
bin/behat --config application/tests/behat.yml application/tests/features/api.messages.feature
```

Reviewers: eyedol, dkobia

Subscribers: PapaLee, rjmackay, lkamau

Maniphest Tasks: T189

Differential Revision: https://phabricator.ushahidi.com/D101