Merge pull request #2543 from metamx/fixUnregisterChildPorts

UnRegister port in ForkingTaskRunner

indexing-service/src/main/java/io/druid/indexing/overlord/ForkingTaskRunner.java

@@ -425,6 +425,7 @@ public class ForkingTaskRunner implements TaskRunner, TaskLogStreamer
                               }
                             }
 
+                            portFinder.markPortUnused(childPort);
                             if (childChatHandlerPort > 0) {
                               portFinder.markPortUnused(childChatHandlerPort);
                             }