Enable notifications while syncing

- Sync expects notifications to arrive, so send them
- V1 is broken just the same as old server
- Make v2 primary for testing sync
- Make tests ignore order of delivery from redis (hash order is random)
changelog
Use radar_client v0.8.1

This client never sends sync v1.
Subtle differences in behavior (no additional online notification)
Sync callback actually works for v1.
Merge pull request #86 from zendesk/vanchi/bring_back_notifications_while_syncing

Vanchi/bring back notifications while syncing