GCP janitor: support arbitrary cleanup commands instead of simple delete

[chizhg]

Some gcloud cleanup commands are not standard delete commands - https://cloud.google.com/sdk/gcloud/reference/beta/compute/shared-vpc/associated-projects/remove as an example, thus cannot be simply added into the map in https://github.com/kubernetes-sigs/boskos/blob/master/cmd/janitor/gcp_janitor.py#L32-L91.

One option to support this is to add custom functions similar as clean_gke_cluster, but there's probably a better approach?

/cc @ixdy

[ixdy]

If it's literally just a different verb, then we could probably add yet another option to the Resource tuple to specify the verb:

boskos/cmd/janitor/gcp_janitor.py

Lines 30 to 31 in 36bb085

	Resource = collections.namedtuple(
	'Resource', 'api_version group name subgroup condition managed tolerate bulk_delete preserved_names')

(probably with a default None meaning to use the verb delete).

Ultimately this should probably be reimplemented so that we can use the Google Cloud SDK directly, rather than shelling out to gcloud, though that is obviously a more involved effort.

[ixdy]

/kind feature

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

In response to this:

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

This bot triages issues and PRs 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
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/close

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[chizhg]

/reopen
/lifecycle frozen

[k8s-ci-robot]

@chizhg: Reopened this issue.

In response to this:

/reopen
/lifecycle frozen

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