When creating mailboxes, set cur/new/tmp directories' group to dovecot-shared file's group.
When creating mailboxes, set cur/new/tmp directories' group to
dovecot-shared file's group.

--HG--
branch : HEAD

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