domain: support promises

Fixes: https://github.com/nodejs/node/issues/10724
PR-URL: https://github.com/nodejs/node/pull/12489


Reviewed-By: Matthew Loring <mattloring@google.com>
Reviewed-By: Julien Gilli <jgilli@nodejs.org>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>