[pkg-go] Bug#866399: prometheus-node-exporter systemd unit not enabled by default

[Luca Bigliardi]

Package: prometheus-node-exporter
Version: 0.13.0+ds-1

The prometheus-node-exporter debian package does not seem to enable the
systemd unit by default. When prometheus-node-exporter is installed the
first time it starts just fine, but then it does not restart upon a reboot
because its systemd unit is not enabled.

Could you please enable the systemd when the package is installed?
dh-systemd should already do this for you by default.

Thank you,

Luca