Upgrade to SF 5.1; Remove Deprecated Code

Polishing - PR Comments

Remove direct log4j usage in tests

- hazelcast depends on it; retain the dependency just in jmx

Fix hazelcast logger type

spring-integration-jmx/src/test/java/org/springframework/integration/monitor/IdempotentReceiverIntegrationTests.java

@@ -250,7 +250,7 @@ public class IdempotentReceiverIntegrationTests {
 
 		@Bean
 		public HazelcastInstance hazelcastInstance() {
-			return Hazelcast.newHazelcastInstance(new Config().setProperty("hazelcast.logging.type", "log4j"));
+			return Hazelcast.newHazelcastInstance(new Config().setProperty("hazelcast.logging.type", "slf4j"));
 		}