
golangci-lint is GPL-licensed, and its presence in go.mod might lead people to believe that airshipctl links against a GPL-licensed dependency. In reality airshipctl does not link against golangci-lint (thanks to the // +build tools comment), but this change helps to avoid that misconception from being made. Change-Id: I95c223a7f6597e1aa07a025ed2cebbbd6bd7cbd8