Backports: r1185385

Submitted by: sf
Downgrade some more log messages indicating client errors from level error to
info. Add log messages for various reasons to return HTTP_BAD_REQUEST.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x-merge-http-strict@1775705 13f79535-47bb-0310-9956-ffa450edef68