Code review comment for lp:~joke/bzr/file_permissions_authentication.conf

I forgot:

27 + if not GlobalConfig().get_user_option_as_bool(
28 + 'no_insecure_permissions_warning') :

We have a suppress_warnings config option that should be used here instead of introducing a new one (it's a list of warning names that should not be displayed, see bzrlib.config.Config.suppress_warning.