Add the auth provider name as a note in the request so that...

Add the auth provider name as a note in the request so that authn_provider_alias is able to look up the original provider along with the per_dir configuration.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@178052 13f79535-47bb-0310-9956-ffa450edef68