[FLINK-5492] [log] Log unresolved address when starting an ActorSystem

With the Flakka changes we no longer resolve the given hostname into an IP. Thus,
we should henceforth log the unresolved hostname as the address to which the
ActorSystem binds to.

This closes apache#3161.

flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/BootstrapTools.java

@@ -134,7 +134,7 @@ public static ActorSystem startActorSystem(
 				int listeningPort,
 				Logger logger) throws Exception {
 
-		String hostPortUrl = NetUtils.hostAndPortToUrlString(listeningAddress, listeningPort);
+		String hostPortUrl = listeningAddress + ':' + listeningPort;
 		logger.info("Trying to start actor system at {}", hostPortUrl);
 
 		try {
@@ -146,7 +146,8 @@ public static ActorSystem startActorSystem(
 			logger.debug("Using akka configuration\n {}", akkaConfig);
 
 			ActorSystem actorSystem = AkkaUtils.createActorSystem(akkaConfig);
-			logger.info("Actor system started at {}", hostPortUrl);
+
+			logger.info("Actor system started at {}", AkkaUtils.getAddress(actorSystem));
 			return actorSystem;
 		}
 		catch (Throwable t) {

flink-runtime/src/main/scala/org/apache/flink/runtime/taskmanager/TaskManager.scala

@@ -1741,8 +1741,7 @@ object TaskManager {
 
     // Bring up the TaskManager actor system first, bind it to the given address.
 
-    LOG.info("Starting TaskManager actor system at " + 
-      NetUtils.hostAndPortToUrlString(taskManagerHostname, actorSystemPort))
+    LOG.info("Starting TaskManager actor system at {}:{}.", taskManagerHostname, actorSystemPort)
 
     val taskManagerSystem = try {
       val akkaConfig = AkkaUtils.getAkkaConfig(
@@ -1759,9 +1758,8 @@ object TaskManager {
         if (t.isInstanceOf[org.jboss.netty.channel.ChannelException]) {
           val cause = t.getCause()
           if (cause != null && t.getCause().isInstanceOf[java.net.BindException]) {
-            val address = NetUtils.hostAndPortToUrlString(taskManagerHostname, actorSystemPort)
             throw new IOException("Unable to bind TaskManager actor system to address " +
-              address + " - " + cause.getMessage(), t)
+              taskManagerHostname + ':' + actorSystemPort + " - " + cause.getMessage(), t)
           }
         }
         throw new Exception("Could not create TaskManager actor system", t)