Fix unittests by upgrading to go 1.14 (#1104)
Fix unittests by upgrading to go 1.14 (#1104)

* Presubmits are broken #1103.
* There is an error fetching go modules. The error appears to be related
  to using go 1.12. This PR updates the worker image to a newly built test
  worker image which uses go 1.14. When I ran the tests in the newly
  built image they passed.
kubeflow/manifests,kubeflow/manifests