Add support for cluster reset command. Some tests were refactored per the inclusion of the new command

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

@@ -14,6 +14,8 @@ public class JedisCluster implements JedisCommands, BasicCommands, Closeable {
     public static final short HASHSLOTS = 16384;
     private static final int DEFAULT_TIMEOUT = 1;
     private static final int DEFAULT_MAX_REDIRECTIONS = 5;
+    
+    public static enum Reset {SOFT, HARD}
 
     private int timeout;
     private int maxRedirections;