Skip adding nameprefix to namespace

[Liujingfang1]

Fix #235

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[Liujingfang1]

@droot, as I remember, we also encountered this problem when creating the kustomization for kubebuilder project. We put a comment about the nameprefix. https://github.com/kubernetes-sigs/controller-tools/blob/master/pkg/scaffold/project/kustomize.go#L60
With this change, namespace declared in kustomization.yaml will be independent with prefix.

This change has another impact on kubebuilder project. The namespace in generated manager.yaml should match the namespace in kustomization.yaml. https://github.com/kubernetes-sigs/controller-tools/blob/master/pkg/scaffold/manager/config.go#L48 Not sure if this is a good change in kubebuilder.

Or we allow kustomize to create a namespace resource that is not found from resources or bases.

[monopole]

/lgtm

[droot]

Ouch... this will break kubebuilder generated Kustomizations. Can we have some sort of deprecation in place ?

[myok12]

Is there a plan to fix this (again)?