lib-storage: Open index with MAIL_INDEX_OPEN_FLAG_SAVEONLY if mailbox has MAILBOX_FLAG_SAVEONLY
lib-storage: Open index with MAIL_INDEX_OPEN_FLAG_SAVEONLY if mailbox has MAILBOX_FLAG_SAVEONLY

Distrotech/dovecot,Distrotech/dovecot,Distrotech/dovecot,Distrotech/dovecot,Distrotech/dovecot