Code review comment for ~paelzer/ubuntu/+source/chrony:merge-cosmic-3.3-1

This merge for Chrony drops a few things Debian accepted from us already.
Furthermore two changes are upstream now.

The new upstream release was too close to 18.04 Release, but now we can bring it into Ubuntu.

Furthermore we fix bug 1771028 with that upload.

Test builds in PPA: https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3259