Improve Redis configuration

This commit improves Redis configuration by introducing `@SpringSessionRedisConnectionFactory` qualifier for explicitly declaring a `RedisConnectionFactory` to be used by Spring Session. This is in particular useful in scenarios with multiple `RedisConnectionFactory` beans present in the application context.

Redis configuration is simplified and no longer registers a Spring Session specific `RedisOperations<Object,Object>` bean with the application context.

Users are however able to obtain `RedisOperations<Object,Object>` instance used by Spring Session using newly introduced `@SpringSessionRedisOperations` annotation.

spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java

@@ -38,6 +38,7 @@ import org.springframework.session.Session;
 import org.springframework.session.data.SessionEventRegistry;
 import org.springframework.session.data.redis.RedisOperationsSessionRepository.RedisSession;
 import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
+import org.springframework.session.data.redis.config.annotation.web.http.SpringSessionRedisOperations;
 import org.springframework.session.events.SessionCreatedEvent;
 import org.springframework.session.events.SessionDestroyedEvent;
 import org.springframework.test.context.ContextConfiguration;
@@ -61,7 +62,7 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 	@Autowired
 	private SessionEventRegistry registry;
 
-	@Autowired
+	@SpringSessionRedisOperations
 	private RedisOperations<Object, Object> redis;
 
 	private SecurityContext context;

spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/taskexecutor/RedisListenerContainerTaskExecutorITests.java

@@ -32,6 +32,7 @@ import org.springframework.data.redis.core.BoundSetOperations;
 import org.springframework.data.redis.core.RedisOperations;
 import org.springframework.session.data.redis.AbstractRedisITests;
 import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
+import org.springframework.session.data.redis.config.annotation.web.http.SpringSessionRedisOperations;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.web.WebAppConfiguration;
@@ -49,7 +50,7 @@ public class RedisListenerContainerTaskExecutorITests extends AbstractRedisITest
 	@Autowired
 	private SessionTaskExecutor executor;
 
-	@Autowired
+	@SpringSessionRedisOperations
 	private RedisOperations<Object, Object> redis;
 
 	@Test