* core: add filesystem paths to some common error messages.

Backports: r1301504
Submitted by: covener
Reviewed by: rjung, trawick, wrowe



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1375686 13f79535-47bb-0310-9956-ffa450edef68