Set pytorchjob defaults in test utils

[ohmystack]

When creating a pytorchjob object for testing, the default values should
also be filled in using the same defaulter function in the scheme.

[k8s-ci-robot]

Hi @ohmystack. Thanks for your PR.

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[coveralls]

Coverage remained the same at 85.281% when pulling ce20c0a on ohmystack:defaults-in-test into de8c866 on kubeflow:master.

[gaocegege]

/lgtm
/apprve
/ok-to-test
Thanks for your contribution! 🎉 👍

[gaocegege]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege

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