display gofmt diffs

Author: dmitris

screwdriver.yaml

@@ -15,6 +15,8 @@ jobs:
                 else
                     echo "gofmt violations in the following file(s):"
                     echo "${gofmtOutput}"
+                    echo "\ngofmt diffs:"
+                    gofmt -d .
                     exit 1
                 fi
             - vet: go vet ./...