[Denyhosts-user] REGEX7 fix

[Jason L T. I. <ti...@ma...>]

I'm applying this patch:
  https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=153291
to denyhosts 2.6 in Fedora to get around this error:

denyhosts   : ERROR    regex pattern ( User (?P<user>.*)
not allowed because not listed in AllowUsers ) is missing 'host' group

The version of openssh that's shipping in Fedora, at least, provides
an IP address on that line so there's sufficient info to extract a
host to block.  (That's openssh 4.3p2 in FC5 and FC6, 4.5p1 in F7.)
Failure to block in that instance could be considered by some as a
minor security issue, as then we're not blocking hosts which try to
log in as, say, root, even though there's no chance they could ever do
so because of AllowUsers.

 - J<