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/bug670_sql.h

@@ -1,5 +1,4 @@
-#ifndef BUG670_SQL_H
-#define BUG670_SQL_H
+#pragma once
 
 const char * bug670_sql =
     "set autocommit=0;\
@@ -39,5 +38,3 @@ const char * bug670_sql =
         set autocommit=1;\
         delete from mysql.t1 where id = 7; \
         select 1 as \"endof cycle\" from dual;\n";
-
-#endif // BUG670_SQL_H