text: Title: hack/test-go shows build errors in tmpdir instead of the source tree
  Body: For example:
  
  ```
  /tmp/go-build179154832/github.com/openshift/origin/pkg/api/kubegraph/analysis/_test/_obj_test/hpa.go:26: invalid type assertion: ...
  ```
  
  @smarterclayton thoughts on why?
  