debug: Add helper to get the current default log level for a group

src/libstrongswan/utils/debug.h

@@ -159,6 +159,9 @@ void dbg_default_set_level(level_t level);
 /** set the level logged by dbg_default() for a specific group */
 void dbg_default_set_level_group(debug_t group, level_t level);
 
+/** get the level logged by dbg_default() for a specific group */
+level_t dbg_default_get_level_group(debug_t group);
+
 /** set the stream logged by dbg_default() to */
 void dbg_default_set_stream(FILE *stream);