Can't keep systemd sockets open on Ubuntu 18.04.2

Came across this systemd "bug" tonight, while trying to setup Knot Resolver 2.1.1 on Ubuntu 18.04.2. The Github page in question explicitly calls out a documentation conflict between systemd and kresd for socket clearing behavior.

using Sockets= in a drop-in for instantiated service doesn't clear the list of previously defined sockets

Edited by Tomas Krizek
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