lib-imap-client: When server sends BYE before disconnection, log it as the reason.
lib-imap-client: When server sends BYE before disconnection, log it as the reason.

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