remove unused scripts

[zw0610]

improve status_test from tensorflow

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• remove unused code
• revert SetServicesV2 back to SetServices
• add test code for register_controller.go

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[coveralls]

Pull Request Test Coverage Report for Build 1673998083

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 37.002%

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Totals
Change from base Build 1660952137:	0.3%
Covered Lines:	2283
Relevant Lines:	6170

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💛 - Coveralls

[terrytangyuan]

I remember this was the default. So this isn't used anywhere anymore?

[zw0610]

Seems not. Let's see scripts below:

lucas@Wangs-MacBook-Pro-at-Tencent > /tmp/training-operator-master > grep -rin "KUBEFLOW_NAMESPACE" .
./docs/development/developer_guide.md:47:### Configure KUBECONFIG and KUBEFLOW_NAMESPACE
./docs/development/developer_guide.md:54:export KUBEFLOW_NAMESPACE=$(your_namespace)
./docs/development/developer_guide.md:57:- KUBEFLOW_NAMESPACE is used when deployed on Kubernetes, we use this variable to create other resources (e.g. the resource lock) internal in the same namespace. It is optional, use `default` namespace if not set.
./pkg/apis/mpi/v1/constants.go:21:	EnvKubeflowNamespace = "KUBEFLOW_NAMESPACE"
./pkg/common/constants.go:19:	EnvKubeflowNamespace = "KUBEFLOW_NAMESPACE"

 lucas@Wangs-MacBook-Pro-at-Tencent > /tmp/training-operator-master > grep -rin "EnvKubeflowNamespace" .
./pkg/apis/mpi/v1/constants.go:20:	// EnvKubeflowNamespace is ENV for kubeflow namespace specified by user.
./pkg/apis/mpi/v1/constants.go:21:	EnvKubeflowNamespace = "KUBEFLOW_NAMESPACE"
./pkg/common/constants.go:18:	// EnvKubeflowNamespace is ENV for kubeflow namespace specified by user.
./pkg/common/constants.go:19:	EnvKubeflowNamespace = "KUBEFLOW_NAMESPACE"

I double checked with v1.2.0 and EnvKubeflowNamespace is used there. It seems the transition results in a change in the main function, which lost this option. But we can still remove it here as it's also defined in the kubeflow/common library: https://github.com/kubeflow/common/blob/97658773cce10b2b706e38858e48137ae370ed10/pkg/util/util.go#L31

I open another issue to restore these options: #1522

[terrytangyuan]

/lgtm
/approve

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