Need to test "dh-make-golang make" with actual repos

[anthonyfok]

This is to check that dh-make-golang make is actually working with:

• GitHub, GitLab, Salsa, etc.
• repos with or without releases or tags
• Files-Excluded for both "release pristine .tar.gz tarballs" and "compress our own .tar.xz" mode

Test cases include (but not limited to) repos reported in e.g. the following issues:

• Fails to deal with v2+ module directory #135
• can not load package (github.com/grafana/grafana) #164
• Fails to create the orig tarball for non-GitHub repos #180