[sudo-workers] Ignore unknown Defaults parameters selectively

[Todd C. Miller]

It's not currently possible to prevent that warning.  I've just
committed a support for an ignore_unknown_defaults flag that prevents
it.  I don't think it is worth the complexity of trying to ignore
warnings for specific Defaults entries so the flag acts globally.

https://www.sudo.ws/repos/sudo/rev/a7fdb44677dd

 - todd