[Dovecot] v2.0.21 released

http://dovecot.org/releases/2.0/dovecot-2.0.21.tar.gz http://dovecot.org/releases/2.0/dovecot-2.0.21.tar.gz.sig

    + dict: file backend supports now also fcntl/flock locking optionally
    - imap-login: Memory leak fixed
    - imap: Non-UTF8 input on SEARCH command parameters could have crashed
    - auth: Fixed crash with DIGEST-MD5 when attempting to do master user
      login without master passdbs. 
    - sdbox: Don't use more fds than necessary when copying mails.
    - mdbox kept the user's storage locked a bit longer than it needed to