debathena-kerberos-config shouldn’t require ntp when systemd-timesyncd is installed

[bbaren]

debathena-kerberos-config Depends on time-daemon as a proxy for “This host has correctly configured time so the Kerberos handshake works”. systemd currently comes with systemd-timesyncd, which satisfies that requirement, but systemd doesn’t Provide time-daemon. As a result, installing debathena-kerberos-config on a fresh Debian installation will unnecessarily pull in ntp instead of just relying on systemd-timesyncd.

The correct solution here is to have systemd Provide time-daemon, but that  causes other problems. I suspect the Debian folks would prefer for us just to introduce systemd as an alternative to ntp/ntpdate.