[Security] Prevent invalid client hostnames from appearing in

the log file. If a double-reverse lookup was performed (e.g.,
for an "Allow from .my.domain" directive) but failed, then
a spoofed dns-reverse-address could appear in the logs. Now
the numeric address is logged instead. Note that
reverse-address-spoofing did NOT actually allow access
to any protected resource! It was only possible to cause apache to
log arbitrary names (for resources protected thusly) if you had
control over the reverse dns zone.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@93426 13f79535-47bb-0310-9956-ffa450edef68