MXS-2243 System tests brings VMs by themselves (#193)

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/sql_t1.h

@@ -1,5 +1,4 @@
-#ifndef SQL_T1_H
-#define SQL_T1_H
+#pragma once
 
 #include "mariadb_func.h"
 #include "testconnections.h"
@@ -72,6 +71,4 @@ int select_from_t1(MYSQL* conn, int N);
  * @param conn MYSQL handler
  * @return 0 if content of t1 is ok
  */
-int check_if_t1_exists(MYSQL* conn);
-
-#endif      // SQL_T1_H
+int check_if_t1_exists(MYSQL *conn);