MXS-1312: Add tests for permission type rule

The test checks that rules with only optional parts defined work.

maxscale-system-test/fwf2.cpp

@@ -65,7 +65,7 @@ int main(int argc, char *argv[])
     FILE* file;
 
     sprintf(rules_dir, "%s/fw2/", test_dir);
-    int N = 4;
+    int N = 5;
     int i;
 
     for (i = 1; i < N + 1; i++)