Migrate code implementation to kubeflow/common fashion

[Jeffwan]

kubeflow/common release a stable version 0.3.1 and we can migrate to use implementation of kubeflow/common.

The change will be similar to change https://github.com/kubeflow/tf-operator/pull/1171.

It would be better to resolve dependencies, upgrade to 0.3.1 for interfaces, and then update implementation.

Hope this can be part of 1.1 release.

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[johnugeorge]

I am worried if it is little late for the 1.1 release. TF-operator one too has not been tested extensively with common.

[Jeffwan]

@johnugeorge Yeah, If we can not catch 1.1 release, I think we can postpone to next release. As TF and Pytorch already graduate to v1, we definitely need more test to avoid regression issues.