MB-11636: Don't delay sending of TCP packets

The UPR TCP connection haven't had the {nodelay, true} option set. Hence
the sending of packets was delayed.

Change-Id: I14851dfa37fba6f44809b8365d6d6c17c6b7dad1
Reviewed-on: http://review.couchbase.org/39111
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Volker Mische <volker.mische@gmail.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Dave Rigby <daver@couchbase.com>