If running from inetd, don't try to open/close listener sockets when receiving SIGHUP.
If running from inetd, don't try to open/close listener sockets when
receiving SIGHUP.

--HG--
branch : HEAD

jwm/dovecot-notmuch,dscho/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,dscho/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,dscho/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,dscho/dovecot