*) mod_authz_host: add "forward-dns" authorization provider
trunk patch: http://svn.apache.org/r1734412
2.4.x patch: trunk should work (possible minor issue on next-number)
- +1: fabien, ylavic
+ +1: fabien, ylavic, jim
ylavic: I would have liked more (doc) emphasis on the lower security of
"Require forward-dns" vs "Require host"'s double DNS lookup but
that could/should be a (short) follow up, though if it can be done