[Dovecot] v1.2.17 released

http://dovecot.org/releases/1.2/dovecot-1.2.17.tar.gz http://dovecot.org/releases/1.2/dovecot-1.2.17.tar.gz.sig

The important changes since v1.2.16:

    - Fixed potential crashes and other problems when parsing header names
      that contained NUL characters.
    - IMAP: Fixed a memory leak with ESEARCH command handling
    - Quota warnings could have been executed at incorrect times with
      some configs.