fix: add mpijobs to kubeflow training role

[henrysecond1]

What this PR does / why we need it:

mpijob resource is missing in kubeflow training role.

[aws-kf-ci-bot]

Hi @henrysecond1. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Pull Request Test Coverage Report for Build 2056363215

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 37.184%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/pytorch/pytorchjob_controller.go	9	62.24%

Totals
Change from base Build 2047967140:	-0.1%
Covered Lines:	2298
Relevant Lines:	6180

---

💛 - Coveralls

[terrytangyuan]

/lgtm
/approve

[gaocegege]

Thanks for your contribution! 🎉 👍

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege, henrysecond1, terrytangyuan

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• OWNERS [gaocegege,terrytangyuan]

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[gaocegege]

/ok-to-test