Use apr_parse_addr_port() in fix_hostname(). This simplifies the

code by a small (okay, tiny) amount and lets IPv6 numeric address
strings be passed through.
Obtained from:  the idea is from the KAME IPv6 patch for Apache 1.3


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87370 13f79535-47bb-0310-9956-ffa450edef68