New port: net-mgmt/netdata-go

go.d.plugin is a netdata external plugin.
It is an orchestrator for data collection modules written in go.
It runs as an independent process ps fax shows it.
It is started and stopped automatically by netdata.

WWW: https://github.com/netdata/go.d.plugin

PR: 244291
Submitted by: Dries Michiels <driesm.michiels@gmail.com>