ad trust: accept subordinate domains of the forest trust root
Commit 8b6d1ab854387840f7526d6d59ddc7102231957f added support for
subordinate UPN suffixes but missed the case where subordinate UPN is a
subdomain of the forest root domain and not mentioned in the UPN
Correct this situation by applying the same check to the trusted domain
name as well.
Signed-off-by: Alexander Bokovoy <firstname.lastname@example.org>
Reviewed-By: Alexander Bokovoy <email@example.com>