Give an error if inbox=yes namespace is missing. Previously we attempted to set it automatically, but that didn't work.
Give an error if inbox=yes namespace is missing.
Previously we attempted to set it automatically, but that didn't work.

--HG--
branch : HEAD

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