[Dovecot] v1.2.17 released

[Timo Sirainen]

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.