Fix a security exposure in mod_access. Previously when IPv6

listening sockets were used, allow/deny-from-IPv4-address rules
were not evaluated properly (PR #7407).  Also, add the ability to
specify IPv6 address strings with optional prefix length on Allow
and Deny.

Note: A bit more of PR #7407 remains dealing with a problem with
double-reverse lookups when an IPv6 listening socket is used.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88522 13f79535-47bb-0310-9956-ffa450edef68