for proxy CONNECT handling:

  don't hard-code the address family of the target; respect
  what the resolver told us

  get a new socket each time we try to connect to one of the
  target addresses as reported by the resolver; you can't
  portably attempt to connect more than once on the same
  socket

this is the same fix committed to proxy http support yesterday


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92735 13f79535-47bb-0310-9956-ffa450edef68