Refactor mpijob-controller

[tenzen-y]

Currently, the mpijob-controller has logic similar to kubeflow/common by oneself since the mpijob-controller does not depend on kubeflow/common.

So when we want to fix or add controller logic, we must apply the same patches to kubeflow/common and mpijob-controller.

Since that is a high maintenance cost, it might be better to refactor the mpijob-controller using kubeflow/common.

[tenzen-y]

/kind feature

[terrytangyuan]

Great idea.

[johnugeorge]

Related: #1714

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tenzen-y]

/remove-lifecycle stale

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tenzen-y]

/lifecycle frozen