utils: add nm_utils_parse_debug_string() to replace g_parse_debug_string()

g_parse_debug_string() interprets the string "help" special and accepts
an "all" tag to invert the result. We don't want that.

src/NetworkManagerUtils.h

@@ -429,5 +429,8 @@ void nm_utils_g_value_set_object_path_array (GValue *value,
                                              GSList *objects,
                                              NMUtilsObjectFunc filter_func,
                                              gpointer user_data);
+guint nm_utils_parse_debug_string (const char *string,
+                                   const GDebugKey *keys,
+                                   guint nkeys);
 
 #endif /* __NETWORKMANAGER_UTILS_H__ */