Backport:

mod_ssl: The error message when SSLCertificateFile is missing should
at least give the name or position of the problematic virtual host
definition.
Submitted by: Stefan Fritsch <sf sfritsch.de>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@815943 13f79535-47bb-0310-9956-ffa450edef68