using ./format-json script

From now on, hosts keys will always be checked and there is no way
to disable the check

remove also software/unstable/zimbra-kvm which were still referencing
those recipes

using https://github.com/matomo-org/matomo/pull/13676

This repairs a NameError introduced in 397726e1 (erp5/neoppod/slapos:
Support for python3 from aurel/zope4 branch., 2022-02-03) that was
causing ERP5-IOS test suite to fail in loop.

a binary make use of it and do not any more download a binary. Instead
compile on the fly.

Nettle has hard dependency on openssl, and --disable-openssl is only
disabling optional feature of it.

we have implemented this in ERP5 repository