mod_dbd backports:

  (1) Key connection pools to virtualhosts (niq, minfrin; reviewed us + wrowe)
  (2) share per-request database handles across subrequests (chrisd; reviewed
      niq + rpluem).  Including fixing compiler warning (rpluem).

More to come on mod_dbd


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@485053 13f79535-47bb-0310-9956-ffa450edef68