The code for reestablishing conns begins after we retrieve a
request from the queue. However, since the request was removed from the
queue we no longer have access to it, resulting in a dropped request.
This commit adds another queue to aggregate any requests during client
restarts in order to preserve and handle them after the connection has been
reestablished. This queue would have higher priority than the normal
requests queue meaning that normal requests would only get processed
if and only if there aren't any more "dropped" requests to handle.
