Simplify CLUSTER MYID command for Jedis.

Closes #2226

Author: dengliming

src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterConnection.java

@@ -70,6 +70,7 @@
  * @author Tao Chen
  * @author Chen Guanqun
  * @author Pavel Khokhlov
+ * @author Liming Deng
  * @since 1.7
  */
 public class JedisClusterConnection implements DefaultedRedisClusterConnection {
@@ -577,13 +578,10 @@ public Set<RedisClusterNode> clusterGetSlaves(RedisClusterNode master) {
 	@Override
 	public Map<RedisClusterNode, Collection<RedisClusterNode>> clusterGetMasterSlaveMap() {
 
-		List<NodeResult<Collection<RedisClusterNode>>> nodeResults = clusterCommandExecutor
-				.executeCommandAsyncOnNodes((JedisClusterCommandCallback<Collection<RedisClusterNode>>) client -> {
-
-					// TODO: remove client.eval as soon as Jedis offers support for myid
-					return JedisConverters.toSetOfRedisClusterNodes(
-							client.clusterSlaves((String) client.eval("return redis.call('cluster', 'myid')", 0)));
-				}, topologyProvider.getTopology().getActiveMasterNodes()).getResults();
+		List<NodeResult<Collection<RedisClusterNode>>> nodeResults = clusterCommandExecutor.executeCommandAsyncOnNodes(
+				(JedisClusterCommandCallback<Collection<RedisClusterNode>>) client -> JedisConverters
+						.toSetOfRedisClusterNodes(client.clusterSlaves(client.clusterMyId())),
+				topologyProvider.getTopology().getActiveMasterNodes()).getResults();
 
 		Map<RedisClusterNode, Collection<RedisClusterNode>> result = new LinkedHashMap<>();