- utilize default methods instead of rolling local ones;
- avoid to specify BEFORE conditions we don't really need
(pflog will be REQUIRE'd by pf);
- omit extra decoration from warning messages, warn() will
decorate them sufficiently.
part of the pf module.
While here fix a comment that was c'n'ped from rc.d/pf
PR: bin/71096 (partly)
Submitted by: Ville-Pertti Keinonen
MFC after: 2 days