lib-storage: Allow appending to existing settings via userdb extra fields. "foo=bar" replaces the setting, while "+foo=bar" appends to the setting.
lib-storage: Allow appending to existing settings via userdb extra fields.
"foo=bar" replaces the setting, while "+foo=bar" appends to the setting.

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