golang pack go lint can't handle dir with a : in the name

[rawlingsj]

From slack a user with bitbucketserver tried the golang quickstart but it fails in the release pipeline with

Makefile:24: *** target pattern contains no `%'.  Stop.

This can be recreated by creating a golang quickstart in your go path under a git server that includes a : port e.g.

~/go/src/mybitbucketserver:1234/rawlingsj/foo

Now run make build in that folder.

The issue is the paths that go list ./... | grep -v /vendor | grep -v generated from https://github.com/jenkins-x/draft-packs/blob/dfda4a9/packs/go/Makefile#L9 returns contain the : which causes issues in the Makefile targets.

A hack to get the quickstart going in this scenario was to replace : with _ in the PKGS var but that disabled the lint so is a pretty horrid workaround.

We should come up with a way to escape or workaround better.