- pacrypt(): some small changes after Szilagyi Jozsef's patch:
- comment out unused $crypt_method
- change $dovecotpw default to "doveadm pw" (unrelated to the patch)
- set $dovepasstest to "-t $pw_db" instead of having two similar
command lines, and also shellescapearg() $pw_db
- use "if (empty($dovepasstest))" instead of "if (empty($pw_db))"