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/get_my_ip.h

@@ -1,5 +1,4 @@
-#ifndef GET_MY_IP_H
-#define GET_MY_IP_H
+#pragma once
 
 /**
  * @brief get_my_ip Get IP address of machine where this code is executed as it is visible from remote machine
@@ -8,6 +7,4 @@
  * @param my_ip Pointer to result (own IP string)
  * @return 0 in case of success
  */
-int get_my_ip(char* remote_ip, char* my_ip);
-
-#endif      // GET_MY_IP_H
+int get_my_ip(char * remote_ip, char *my_ip );