dovecot-example.conf: Moved userdb prefetch before other userdbs, since that's where it should be.
dovecot-example.conf: Moved userdb prefetch before other userdbs, since that's where it should be.

--HG--
branch : HEAD

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