Refactor to have interfaces.

Add cluster pipeline commands.

src/main/java/redis/clients/jedis/ClusterCommands.java

@@ -0,0 +1,23 @@
+package redis.clients.jedis;
+
+import java.util.List;
+
+public interface ClusterCommands {
+    String clusterNodes();
+
+    String clusterMeet(final String ip, final int port);
+
+    String clusterAddSlots(final int... slots);
+
+    String clusterDelSlots(final int... slots);
+
+    String clusterInfo();
+
+    List<String> clusterGetKeysInSlot(final int slot, final int count);
+
+    String clusterSetSlotNode(final int slot, final String nodeId);
+
+    String clusterSetSlotMigrating(final int slot, final String nodeId);
+
+    String clusterSetSlotImporting(final int slot, final String nodeId);
+}