MXS-2243_labels Maxscale system tests prepare environment by themselves

maxscale-system-test changed in order to control test environment by itself.
Every test checks which machines are running, compare with list of needed machines
and start new VMs is they are missing in the running machines list.
Tests are executiong MDBCI commands, MDBCI executable should be in the PATH

maxscale-system-test/different_size.h

@@ -1,5 +1,4 @@
-#ifndef DIFFERENT_SIZE_H
-#define DIFFERENT_SIZE_H
+#pragma once
 
 #include <iostream>
 #include <unistd.h>
@@ -34,5 +33,3 @@ void set_max_packet(TestConnections* Test, bool binlog, char * cmd);
  * @param binlog if true - connects to Master, otherwise - to RWSplit router
  */
 void different_packet_size(TestConnections* Test, bool binlog);
-
-#endif // DIFFERENT_SIZE_H