@ivar source_handshake: Signed handshake from source (remote import only)
@ivar source_x509_ca: Source X509 CA in PEM format (remote import only)
@ivar source_instance_name: Previous name of instance (remote import only)
@ivar source_handshake: Signed handshake from source (remote import only)
@ivar source_x509_ca: Source X509 CA in PEM format (remote import only)
@ivar source_instance_name: Previous name of instance (remote import only)