Fix Master Label for PyTorchJob

[andreyvelich]

We shouldn't convert replica type to lower in IsMasterRole function for PyTorchJob since the replica type that we send is equal to Worker or Master as rtype: https://github.com/kubeflow/training-operator/blob/master/pkg/controller.v1/common/pod.go#L319

We are doing the same for TFJob: https://github.com/kubeflow/training-operator/blob/master/pkg/controller.v1/tensorflow/tfjob_controller.go#L609.

/assign @johnugeorge @deepanker13 @tenzen-y

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In response to this:

We shouldn't convert replica type to lower in IsMasterRole function for PyTorchJob since the replica type that we send is equal to Worker or Master as rtype: https://github.com/kubeflow/training-operator/blob/master/pkg/controller.v1/common/pod.go#L319

We are doing the same for TFJob: https://github.com/kubeflow/training-operator/blob/master/pkg/controller.v1/tensorflow/tfjob_controller.go#L609.

/assign @johnugeorge @deepanker13 @tenzen-y

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[coveralls]

Pull Request Test Coverage Report for Build 7414403602

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 42.782%

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Totals
Change from base Build 7285460954:	-0.1%
Covered Lines:	3746
Relevant Lines:	8756

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💛 - Coveralls

[tenzen-y]

Thanks!
/lgtm
/approve

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