Apply PF* commands to JedisCluster, ShardedJedis

* Apply PF* commands to JedisCluster, ShardedJedis
* PF* commands to interface
** pfadd / pfcount : JedisCommands
** pfmerge : MultiKeyCommands

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

@@ -570,4 +570,16 @@ public class ShardedJedis extends BinaryShardedJedis implements JedisCommands {
 	Jedis j = getShard(key);
 	return j.zscan(key, cursor);
     }
+
+    @Override
+    public Long pfadd(String key, String... elements) {
+	Jedis j = getShard(key);
+	return j.pfadd(key, elements);
+    }
+
+    @Override
+    public long pfcount(String key) {
+	Jedis j = getShard(key);
+	return j.pfcount(key);
+    }
 }