add kubeconfig flag

[yeya24]

Signed-off-by: yeya24 yb532204897@gmail.com
Enable defining kubeconfig path in flag.

Mirror PR: kubeflow/training-operator#1049

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This change is 

[k8s-ci-robot]

Hi @yeya24. 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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[gaocegege]

/lgtm
/approve

[suleisl2000]

/ok-to-test

[suleisl2000]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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