HDFS-11508. Fix bind failure in SimpleTCPServer & Portmap where bind fails because socket is in TIME_WAIT state. Contributed by Mukul Kumar Singh.

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpServer.java

@@ -81,6 +81,7 @@ public class SimpleTcpServer {
     });
     server.setOption("child.tcpNoDelay", true);
     server.setOption("child.keepAlive", true);
+    server.setOption("reuseAddress", true);
 
     // Listen to TCP port
     ch = server.bind(new InetSocketAddress(port));

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/portmap/Portmap.java

@@ -109,12 +109,14 @@ final class Portmap {
             RpcUtil.STAGE_RPC_TCP_RESPONSE);
       }
     });
+    tcpServer.setOption("reuseAddress", true);
 
     udpServer = new ConnectionlessBootstrap(new NioDatagramChannelFactory(
         Executors.newCachedThreadPool()));
 
     udpServer.setPipeline(Channels.pipeline(RpcUtil.STAGE_RPC_MESSAGE_PARSER,
         handler, RpcUtil.STAGE_RPC_UDP_RESPONSE));
+    udpServer.setOption("reuseAddress", true);
 
     tcpChannel = tcpServer.bind(tcpAddress);
     udpChannel = udpServer.bind(udpAddress);