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/Transaction.java

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