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/mysqlmon_rejoin_good.cpp

@@ -80,7 +80,7 @@ int main(int argc, char** argv)
         // Switch master back to server1 so last check is faster
         int ec;
         test.maxscales->ssh_node_output(0, "maxadmin call command mysqlmon switchover "
-                                        "MySQL-Monitor server1 server2" , true, &ec);
+                                        "MySQL-Monitor server1 server2", true, &ec);
         test.maxscales->wait_for_monitor(); // Wait for monitor to update status
         get_output(test);
         master_id = get_master_server_id(test);