Fix Spring Boot based Hazelcast samples

This commit removes unused Hazelcast client dependencies and test support from Spring Boot based Hazelcast samples.

Closes: gh-1902

spring-session-samples/spring-session-sample-boot-hazelcast/src/main/java/sample/config/SessionConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2020 the original author or authors.
+ * Copyright 2014-2021 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.
@@ -34,7 +34,7 @@ import org.springframework.session.hazelcast.PrincipalNameExtractor;
 public class SessionConfig {
 
 	@Bean
-	public Config clientConfig() {
+	public Config hazelcastConfig() {
 		Config config = new Config();
 		NetworkConfig networkConfig = config.getNetworkConfig();
 		networkConfig.setPort(0);