Remove AuthzProviderAlias from the regular list of directives, so it doesn't...

Remove AuthzProviderAlias from the regular list of directives, so it doesn't clash with the section directives list.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1336428 13f79535-47bb-0310-9956-ffa450edef68