(#9508) Unify auth no and auth any in the system.

In auth.conf, a setting of auth no means that only unauthenticated
requests are allowed. If you actually have a certificate you can't use the
service. (Yes, anonymous users have *more* access than authenticated ones.)

This is about as strange as you can get, so instead we unify those: you now
have the choices auth yes and auth any; auth no is an alias for the
later.

Signed-off-by: Daniel Pittman <daniel@puppetlabs.com>