True if Peer is covered by the ruleset RuleSet. Peer is a term
ip(A,B,C,D). RuleSet is a predicate with one argument that is
either a partial ip term, a hostname or a domainname.
Domainnames start with a '.'.
Arguments:
PlusMin
- Positive/negative test. If IP->Host fails, a
positive test fails, while a negative succeeds.
I.e. deny('.com') succeeds for unknown IP
addresses.
x_forwarded host contains multiple hosts separated by ', ' if
there are multiple proxy servers in between. The first one is
the one the user's browser knows about.