Handle INBOX-prefixed namespaces better. Avoid duplicate INBOX replies if namespace prefix is given.
Handle INBOX-prefixed namespaces better. Avoid duplicate INBOX replies if
namespace prefix is given.

--HG--
branch : HEAD

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