If connection closed because of EPIPE, log it as "Connection closed" instead of including "Broken pipe", which gets people worried.
If connection closed because of EPIPE, log it as "Connection closed" instead
of including "Broken pipe", which gets people worried.

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branch : HEAD

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