Allow populator to have more control over RBAC

[mkimuram]

Populator pods created through RunController in populator-machinery may need to access to some k8s resources, therefore RBAC needs to be set for the populator pods.

[mkimuram]

We may be able to choose either of the below approaches:

1. Set the same ServiceAccount as the controller pod,
2. Add an argument to RunController to specify a ServiceAccount for the populator pod.

WDYT? @bswartz

[mkimuram]

@bswartz I've made a prototype on top of the cross-namespace snapshot PR.

It defines patchPodFunc and pass it to RunController so that library user can patch the pod.
Please check here for details. If it looks good, I will create a separate PR only for this change.

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
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/close not-planned

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