Fix a couple of mod_proxy problems forwarding HTTP connections:

(1) PR #9190  It failed to connect to IPv6 hosts.
(2) It failed to connect when the first IP address returned by
    the resolver was unreachable but a secondary IP address was.

PR:    9190 (partly)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92727 13f79535-47bb-0310-9956-ffa450edef68