INTSAMPLES-79 - Update TCP Samples to Use S-I-IP TestingUtilities

* Also: Don't use hard-coded port in *tcp-client-server-multiplex* sample

For reference: https://jira.springsource.org/browse/INTSAMPLES-79

basic/tcp-client-server/src/main/java/org/springframework/integration/samples/tcpclientserver/support/SocketUtils.java

@@ -1,44 +0,0 @@
-/*
- * Copyright 2002-2012 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.integration.samples.tcpclientserver.support;
-
-import java.net.ServerSocket;
-
-import javax.net.ServerSocketFactory;
-
-/**
- *
- * @author Gunnar Hillert
- *
- */
-public final class SocketUtils {
-
-	public static int findAvailableServerSocket(int seed) {
-		for (int i = seed; i < seed+200; i++) {
-			try {
-				ServerSocket sock = ServerSocketFactory.getDefault().createServerSocket(i);
-				sock.close();
-				return i;
-			} catch (Exception e) { }
-		}
-		throw new RuntimeException("Cannot find a free server socket");
-	}
-
-	public static int findAvailableServerSocket() {
-		return findAvailableServerSocket(5678);
-	}
-
-}