Rename cassandra bean names

Closes gh-8982

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -61,7 +61,7 @@ public class CassandraAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public Cluster cluster() {
+	public Cluster cassandraCluster() {
 		CassandraProperties properties = this.properties;
 		Cluster.Builder builder = Cluster.builder()
 				.withClusterName(properties.getClusterName())

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/cassandra/CassandraDataAutoConfiguration.java

@@ -106,7 +106,7 @@ public class CassandraDataAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean(Session.class)
-	public CassandraSessionFactoryBean session(CassandraConverter converter)
+	public CassandraSessionFactoryBean cassandraSession(CassandraConverter converter)
 			throws Exception {
 		CassandraSessionFactoryBean session = new CassandraSessionFactoryBean();
 		session.setCluster(this.cluster);