reviewdog: ignore underscores in package names

[7AC]

Unfortunately this is the best we can do between golint and reviewdog:

golang/lint#98 (comment)

[ruflin]

Nice trick. WFG

[andrewkroh]

I ran across this the other day and thought it was sort of interesting. https://github.com/kubernetes-incubator/cri-o/blob/master/.tool/lint

[7AC]

gometalinter is actually what I run in my editor, and is a superset of golint and other tools IIRC. Doesn't look like reviewdog supports it though.