More db tests (#225)
More db tests (#225)

* Remove obsolete comments and an import

Signed-off-by: IWAMOTO Toshihiro <8e41ae29694291a01b8efca6b4a0005a87ddb93e@valinux.co.jp>

* Add Worker UTs

Signed-off-by: IWAMOTO Toshihiro <8e41ae29694291a01b8efca6b4a0005a87ddb93e@valinux.co.jp>

kubeflow/katib,kubeflow/katib,kubeflow/katib,kubeflow/katib,kubeflow/katib,kubeflow/katib