Providers defined in <AuthnProviderAlias have not been usable under

in virtual hosts since migrating from mod_authn_alias to mod_authn_core.
PR 55622.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1554995 13f79535-47bb-0310-9956-ffa450edef68