Revert "prometheus-node-exporter: upgrade to 1.0.0"

This reverts commit 80dce538fe284a867f72196a8b39e798934ec093.

This requires go 1.14; only 1.13 made it into Alpine 3.12.

prometheus-node-exporter: upgrade to 1.0.0

prometheus-node-exporter: init: correct variables

prometheus-node-exporter: update init.d/conf.d

prometheus-node-exporter: normalize package

Move prometheus packages into main repo