Lets break this into use cases in Bionic:

I was not sure who should win in each case.
We might either want the clear "order" chrony > ntp > openntp > 
Or we might want a "last installed" approach, but that is hard as upgrades to 
not count here only real "install". What would "--reinstall" be in these cases?
Maybe we should stick with the clear order, that at least seems more 
Cases 4-6 try to cover testing that order invariancy.

This is an "ideal world" approach, not sure if we can achieve that in the short 
After the "=>" assignment is the service that should run (and only this one).

0. default install - systemd-timesyncd

1. default install - install chrony => Chrony
1b.                - remove chrony => systemd-timesyncd

2. default install - install ntp  => NTP
2b.                - remove ntp => systemd-timesyncd

3. default install - install openntp => openntp
3b.                - remove openntp => systemd-timesyncd

4. default install - install ntp, install chrony => Chrony
4b.                  remove chrony => NTP
4c.                  remove NTP => systemd-timesyncd

5. default install - install chrony, install NTP => Chrony
5b.                  remove Chrony => NTP
5c.                  remove NTP => systemd-timesyncd

6. default install - install openntp => openntp
6b.                  install NTP => NTP
6c.                  install chrony => chrony
6d.                  remote NTP & Chrony => openntp
6e.                  remove openntp => systemd-timesyncd

7. xenial with ntp - upgrade to B => NTP

8. xenial with ntp - upgrade to B, install chrony => Chrony

9. xenial with ntp - upgrade to B, remove NTP => systemd-timesyncd

10. xenial without ntp - upgrade to B => systemd-timesyncd

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  replacement of ifupdown with netplan needs integration for
  /etc/network/if{up,down}.d scripts

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