[pkg-go] Bug#1146943: keep golang-github-unknwon-goconfig out of forky/testing and consider removal

[Drew Parsons]

Source: golang-github-unknwon-goconfig
Followup-For: Bug #1146943

Do Not Remove.

Required by rclone


These zombie-removal bugs are extremely hostile.

Fair enough to remove from testing,
but why is dependency in unstable not taken into consideration before
sayinf hostile things like "consider re-assigning this to a ftp-master
RM bug to finally trigger removal of it" ?