6978200: ServerSocket.toString include "port=0" in the returned String

Removal of "port=0" from ServerSocket.toString method

Reviewed-by: alanb, chegar

jdk/src/share/classes/java/net/ServerSocket.java

@@ -716,7 +716,6 @@ class ServerSocket implements java.io.Closeable {
         if (!isBound())
             return "ServerSocket[unbound]";
         return "ServerSocket[addr=" + impl.getInetAddress() +
-                ",port=" + impl.getPort() +
                 ",localport=" + impl.getLocalPort()  + "]";
     }