[knot-dns-users] prepare-environment

Hi, I just upgraded to Knot 2.0 from the PPA repository and noticed that the script /usr/lib/knot/prepare-environment is still expecting the old style configuration format and as such is not working with the new YAML formatted configuration. As a consequence the /run/knot directory is not chown'ed to the configured user:group and the control socket creation fails. Cheers, Antti