Backport of AuthDigestEnableQueryStringHack

Needs a doc update to explain what it does.

PR: 27785
Reviewed by: Andr� Malo, Geoffrey Young, Paul Querna


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@104218 13f79535-47bb-0310-9956-ffa450edef68