VMM/password: Code cleanups: - Rely no longer on Crypto.Hash for md4 support. Python's hashlib on FreeBSD, Linux and OpenBSD provides the md4 hash. - Dropped DIGEST-MD5 password hashing for Dovecot <= v1.1.12/v1.2.beta2

.. |curr_vers_rel_date| replace:: The most current version of vmm is 0.6.1,
 released on 03 October 2012.
.. |rel_hist| replace:: Older releases are listed in the :doc:`release_history`.