This adds audit plugin support to the sudoers module, currently
only used for accept events. As a result, the sudoers file is now
initially parsed as an audit plugin.
Previously we needed to include headers required by the various
sudo*h files. Now those files are more self-sufficient and we
should only include headers needed by code in the various .c files.
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.
