Merge r832172 from trunk:

Vhosts: treating a pure-numeric Host header as a port is nonsense.
PR 44979

Submitted by: niq
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@984172 13f79535-47bb-0310-9956-ffa450edef68