Print msg upon success for commands that were silent

src/daemon/rpc_command_executor.cpp

@@ -1302,6 +1302,7 @@ bool t_rpc_command_executor::start_save_graph()
 		}
 	}
 	
+	tools::success_msg_writer() << "Saving graph is now on";
 	return true;
 }
 
@@ -1327,6 +1328,7 @@ bool t_rpc_command_executor::stop_save_graph()
 			return true;
 		}
 	}
+	tools::success_msg_writer() << "Saving graph is now off";
 	return true;
 }
 
@@ -1493,6 +1495,7 @@ bool t_rpc_command_executor::flush_txpool(const std::string &txid)
         }
     }
 
+    tools::success_msg_writer() << "Pool successfully flushed";
     return true;
 }
 
@@ -1795,6 +1798,7 @@ bool t_rpc_command_executor::relay_tx(const std::string &txid)
         }
     }
 
+    tools::success_msg_writer() << "Transaction successfully relayed";
     return true;
 }