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
# All parameters are described in pgsql_table(5) / PGSQL PARAMETERS## The hosts that Postfix will try to connect to and query from.hosts=localhost# The user name and password to log into the pgsql server.user=postfixpassword=some_password# The database name on the servers.dbname=mailsys# The SQL query template used to search the databasequery=SELECTmaildirFROMpostfix_virtual_mailbox_map('%u','%d')