MXS-2458: add template for Clustrix monitor tests

First implementation of Clustrix setup creation
TODO: move Clustrix installation to MDBCI

maxscale-system-test/clustrix_mon.cpp

@@ -0,0 +1,19 @@
+/**
+ * @file clustrix_mon.cpp - simple Clustrix monitor test
+ * Just creates Clustrix cluster and connect Maxscale to it
+ * It can be used as a template for clustrix tests
+ *
+ * See Clustrix_nodes.h for details about configiration
+ */
+
+#include "testconnections.h"
+
+int main(int argc, char* argv[])
+{
+    int i;
+    TestConnections* Test = new TestConnections(argc, argv);
+
+    int rval = Test->global_result;
+    delete Test;
+    return rval;
+}