Warn user if trust is broken
Detect missing ipaNTSecurityIdentifier and print message for a user,
that the trust is broken as result of trust-show and trust-find commands.
https://fedorahosted.org/freeipa/ticket/5665
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Tomas Babej <tbabej@redhat.com>