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/get_com_select_insert.h

@@ -1,5 +1,4 @@
-#ifndef GET_COM_SELECT_INSERT_H
-#define GET_COM_SELECT_INSERT_H
+#pragma once
 
 #include "testconnections.h"
 
@@ -24,6 +23,3 @@ int get_global_status_allnodes(long int *selects, long int *inserts, Mariadb_nod
  */
 int print_delta(long int *new_selects, long int *new_inserts, long int *selects, long int *inserts,
                 int nodes_num);
-
-
-#endif // GET_COM_SELECT_INSERT_H