Fix FailoverClientConnectionFactoryTests

Race condition in `ServerSocket`; the `accept` thread is exiting due to the
close, but it still accepted a new message.

All tests need to wait until the server has stopped listening (as well as
waiting for the close to be propagated to the client).

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/connection/FailoverClientConnectionFactoryTests.java

@@ -570,6 +570,7 @@ public class FailoverClientConnectionFactoryTests {
 		Message<?> replyMessage = replyChannel.receive(10000);
 		assertNotNull(replyMessage);
 		server1.stop();
+		TestingUtilities.waitStopListening(server1, 10000L);
 		TestingUtilities.waitUntilFactoryHasThisNumberOfConnections(client1, 0);
 		outGateway.handleMessage(message);
 		if (!singleUse) {

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/connection/SOLingerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -32,6 +32,7 @@ import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.integration.ip.util.TestingUtilities;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
@@ -42,6 +43,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration
+@DirtiesContext
 public class SOLingerTests {
 
 	@Autowired