Make the gofmt step actually work in CircleCI: until know that step would always work no matter what is pushed, because it was using option -w that just rewrites files locally...
But gofmt step in front of tests, we should fail because of linting as early as possible, no need to waste time testing if the job is going to fail anyway.
Fix one file that was not properly formatted (but because of 1. never got noticed)
This PR does 3 things:
-w
that just rewrites files locally...