Merge r1417529 from trunk:

Add useful mod_status info... try to determine last time
a specific vhost was accessed/used.
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1439388 13f79535-47bb-0310-9956-ffa450edef68