Shadow client field from PipelineBlock and TransactionBlock

* it prevent from user accessing BinaryClient, while it is not treated to pipeline command
** it could make troubles when reading responses

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

@@ -2,5 +2,9 @@ package redis.clients.jedis;
 
 
 public abstract class PipelineBlock extends Pipeline {
+	// For shadowing
+	@SuppressWarnings("unused")
+	private Client client;	
+	
     public abstract void execute();
 }

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

@@ -76,4 +76,8 @@ public class Transaction extends MultiKeyPipelineBase {
         return client.getStatusCodeReply();
     }
 
+	public void setClient(Client client) {
+		this.client = client;
+	}
+
 }

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

@@ -3,6 +3,10 @@ package redis.clients.jedis;
 import redis.clients.jedis.exceptions.JedisException;
 
 public abstract class TransactionBlock extends Transaction {
+	// For shadowing
+	@SuppressWarnings("unused")
+	private Client client;	
+	
     public TransactionBlock(Client client) {
 	super(client);
     }
@@ -13,6 +17,10 @@ public abstract class TransactionBlock extends Transaction {
     public abstract void execute() throws JedisException;
 
     public void setClient(Client client) {
-	    this.client = client;
+	    super.setClient(client);
+    }
+    
+    public String discard() {
+    	return super.discard();
     }
 }