Backport: r1769965

Submitted by: wrowe, rpluem

Actually cause the Host header to be overridden, as noted by rpluem,
and simplify now that there isn't a log-only mode.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x-merge-http-strict@1770386 13f79535-47bb-0310-9956-ffa450edef68