core: Disallow directives in AllowOverrideList which are only allowed
in VirtualHost or server context. These are usually not prepared to be
called in .htaccess files.
Submitted by: sf
Reviewed by: covener, druggeri


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1305137 13f79535-47bb-0310-9956-ffa450edef68