rc.conf(5) and the files' inline documentation.
- Add the "closed"-type, documented in both places, but which did not
exist in the code.
- When provided a ruleset, the system should not make any assumptions
about the sites's policy and should add no rules of its own.
- Make the "UNKNOWN" (documented in-line) actual work as advertised,
load no rules.
Prodded by: Igor M Podlesny <poige@morning.ru>
MFC after: 1 week
5439c489f8