- switch to argon2id by default (from argon2i)
- use OWASP recommended parameters as defaults
This only affects builds that use libargon2, e.g. Debian, and
not builds that use libsodium as argon2id is already the
default there, and better parameters are used
References: https://bugs.openldap.org/show_bug.cgi?id=9827
Signed-off-by: François Kooman <fkooman@tuxed.net>