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/keepalived_func.h

@@ -1,13 +1,11 @@
-#ifndef KEEPALIVED_FUNC_H
-#define KEEPALIVED_FUNC_H
+#pragma once
 
 #include "testconnections.h"
 
 #define FAILOVER_WAIT_TIME 20
 
 char virtual_ip[16];
+
 char* print_version_string(TestConnections* Test);
 void  configure_keepalived(TestConnections* Test, char* keepalived_file);
 void  stop_keepalived(TestConnections* Test);
-
-#endif      // KEEPALIVED_FUNC_H