pool: show the listen port of nfs mover with admin info command

Motivation:
For debugging it's not always trivial to discover NFS mover port number,
especially then there are many pools on the host. Obviously, pool knows
has this information and can display, if asked.

Modification:
Update NfsTransferService to provide the listen port by `getInfo()` cell
command.

Result:
simple way to discover nfs mover port number.

Acked-by: Paul Millar
Target: master
Require-book: no
Require-notes: yes

modules/dcache-nfs/src/main/java/org/dcache/chimera/nfsv41/mover/NfsTransferService.java

@@ -1,6 +1,7 @@
 package org.dcache.chimera.nfsv41.mover;
 
 import com.google.common.collect.Sets;
+import com.google.common.net.InetAddresses;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import diskCacheV111.util.CacheException;
 import diskCacheV111.util.DiskErrorCacheException;
@@ -17,6 +18,7 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.InterruptedIOException;
+import java.io.PrintWriter;
 import java.net.BindException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
@@ -46,7 +48,6 @@
 import org.dcache.commons.stats.RequestExecutionTimeGauges;
 import org.dcache.nfs.ChimeraNFSException;
 import org.dcache.nfs.status.BadHandleException;
-import org.dcache.nfs.status.BadStateidException;
 import org.dcache.nfs.v4.AbstractNFSv4Operation;
 import org.dcache.nfs.v4.AbstractOperationExecutor;
 import org.dcache.nfs.v4.CompoundContext;
@@ -555,4 +556,11 @@ public void run() {
                   });
         }
     }
+
+    @Override
+    public void getInfo(PrintWriter pw) {
+        CellInfoProvider.super.getInfo(pw);
+        var endpoint = _rpcService.getInetSocketAddress(IpProtocolType.TCP);
+        pw.printf("   Listening on: %s:%d\n", InetAddresses.toUriString(endpoint.getAddress()), endpoint.getPort());
+    }
 }