Make tests less verbose

The numeric values of the labels aren't of value when inspecting test
results. For this reason, it makes sense to put them behind the verbose
flag to make test framework debugging happen purpose.

maxscale-system-test/nodes.cpp

@@ -168,6 +168,11 @@ int Nodes::ssh_node(int node, const char* ssh, bool sudo)
                 verbose ? "" :  " > /dev/null");
     }
 
+    if (verbose)
+    {
+        std::cout << ssh << std::endl;
+    }
+
     int rc = 1;
     FILE* in = popen(cmd, "w");