Change how sudo.conf is parsed. We now do a quick parse and then

set the values after the entire file has been parsed.  This lets
us init the debug system earlier.  Plugin-specific debug flags are
now stored in struct plugin_info and struct plugin_container and
passed to the plugin via one or more debug_flags settings.

src/sudo_plugin_int.h

@@ -82,6 +82,7 @@ struct io_plugin_1_1 {
  */
 struct plugin_container {
     TAILQ_ENTRY(plugin_container) entries;
+    struct sudo_conf_debug_file_list debug_files;
     const char *name;
     const char *path;
     char * const *options;