SMTPUTF8: convert UTF-8 domains to IDNA

This isn't entirely correct according to RFC 6531 as it's better to not
convert at all. However this would require we additionally add the UTF-8
form to qmails local recipient users/domains.

Plus our SMTPUTF8 implementation doesn't convert outgoing UTF-8 mails if
receiving MTA doesn't support SMTPUTF8. So mail forwarding might generate
a bounce the user very likely doesn't understand.

As MTAs who support SMTPUTF8 most likely also support the IDNA form,
always converting is probably a good trade-off.

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