event_rabbitmq: event lost on rabbitmq server restart

[ovidiusas]

If the rabbitmq server is restarted, the librabbitmq library will report an AMQP_STATUS_SOCKET_ERROR. The connection will be destroyed and the event lost.
On next received event, opensips will attempt to re-connect and deliver the event.

On this particular error, we should perform a reconnect here and re-send the event (tested ok).
Maybe there are also other errors that require a similar handling.