OpenBSD/src u9POwFnusr.sbin/smtpd to.c smtp_session.c

   second attempt at fixing how we display inet6 addresses in smtpd. this diff
   is simpler than my initial reverted attempt, corrects the likely reason for
   the initial revert and has been running successfully for the day on my MX
   with tons of incoming and outgoing inet6 trafic.

   ok millert@
VersionDeltaFile
1.43+20-5usr.sbin/smtpd/to.c
1.411+14-7usr.sbin/smtpd/smtp_session.c
1.46+10-1usr.sbin/smtpd/envelope.c
+44-133 files

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