kubeflow common dependency path to be updated

[igorvalko]

Taking this fix into account, now pytorch operator should depend on github.com/kubeflow/common/pkg/apis/common/v1 instead of github.com/kubeflow/common/job_controller/api/v1

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[Jeffwan]

@igorvalko Thanks. I will help on this issue. We recently did some refactor on common and plan to work on training operator to apply the latest changes. Currently, there's no API changes for that change.