Backport from HEAD.

mod_auth_digest: Allow sub-requests with different methods than the original
request.  PR 25040.

Submitted by: Josh Dady <jpd@indecicise.com>
Reviewed by: Justin Erenkrantz, Andre Malo, Jeff Trawick, Sander Striker


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@102758 13f79535-47bb-0310-9956-ffa450edef68