Merge r1311183 from trunk:

Fix parsing of Require arguments in <AuthzProviderAlias>.
Add some logging and an assert for a case that should not happen.

PR: 53048

Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1359691 13f79535-47bb-0310-9956-ffa450edef68