Force references to an embedded package's admin or sitewide-admin pages to
be referenced (relative to the embedding package's mount point) as
admin/package-key or sitewide-admin/package-key. This nicely arranges
all admin URLs in a composite package under ${mount-point}/admin, which
among other things will cause the request processor to do the expected
permission check. Backdoor access to the admin pages via URLs like
${mount-point}/package-key/admin or ${mount-point}/package-key/sitewide-admin
is blocked, as the request processor won't do the expected permissions check
for URLs of that form.,