=rem #3643 Remove warning message from normal remote system shutdown.

Conflicts:
	akka-remote/src/main/scala/akka/remote/Remoting.scala
	project/AkkaBuild.scala
Merge pull request #1760 from akka/wip-3643-normal-remoting-shutdown-prints-warning-master-ban

(forward port) =rem #3643 Remove warning message from normal remote system shutdown.