Unify code structure of training job api#1300

Merged

google-oss-robot merged 6 commits intokubeflow:all-in-one-operatorfrom Jeffwan:cleanup_apis

Jul 14, 2021

+42,481-158

Commits on Jul 13, 2021

Run goimports to format the files
Jeffwan
committed

Commits on Jul 14, 2021

Add Plural and Singular to apis constants.go
Jeffwan
committed