lib-storage: Added MAILBOX_ATTRIBUTE_DOVECOT_PREFIX macro.
lib-storage: Added MAILBOX_ATTRIBUTE_DOVECOT_PREFIX macro.

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