_parsegen(): Move the message/rfc822 clause to after the message/delivery-status clause, and genericize it to handle all (other) message/* content types.  This lets us correctly parse 2 more of Anthony's MIME torture tests (specifically, the message/external-body examples).
_parsegen(): Move the message/rfc822 clause to after the
message/delivery-status clause, and genericize it to handle all (other)
message/* content types.  This lets us correctly parse 2 more of Anthony's
MIME torture tests (specifically, the message/external-body examples).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator