Merge r893027 from trunk:

(re)-introduce -T commandline option to suppress documentroot check at startup
PR 41887
Patch by Jan van den Berg

Submitted by: niq
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@984171 13f79535-47bb-0310-9956-ffa450edef68