Initialize `UserStore` before client connects in integration tests

This fixes a failure in `test_contacts` where we were receiving the
initial `proto::UpdateContacts` message before `UserStore` had a chance
to register a message handler for it.
bf638afac5Antonio Scandurra committed on 5/16/2022, 7:48:24 AMparent842bfae
1 file changedLine totals unavailable