golang format tools (#711)
golang format tools (#711)

Produced via:
  `gofmt -s -w $(find -path './vendor' -prune -o -path './third_party' -prune -o -type f -name '*.go' -print)`
  `goimports -w $(find -name '*.go' | grep -v vendor | grep -v third_party)`
/assign maximilien rhuss
/cc maximilien rhuss
knative/client,knative/client