Retry the connection

Occasionally see these:

```
Message: Occurred during run: /task/__gems__/gems/bunny-1.1.2/lib/bunny/transport.rb:246:in `rescue in initialize_socket': Could not establish TCP connection to 127.0.0.1:5672: (Bunny::TCPConnectionFailed)

from /task/__gems__/gems/bunny-1.1.2/lib/bunny/transport.rb:238:in `initialize_socket'
from /task/__gems__/gems/bunny-1.1.2/lib/bunny/transport.rb:253:in `maybe_initialize_socket'
from /task/__gems__/gems/bunny-1.1.2/lib/bunny/transport.rb:50:in `initialize'
```