ClusterLoader2 - update (internal-)?master-ip flags and vars to plural

[mm4tt]

Multi-master support was added to ClusterLoader2 in #544.

We should update the name of master-ip and internal-master-ip flags and vars to plural.

[mm4tt]

/area clusterloader

[mm4tt]

/good-first-issue

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[mm4tt]

Steps:

1. Find all places in k8s.io/test-infra that are setting the MASTER_IP or MASTER_INTERNAL_IP, update them to also set the plural variable (MASTER_IPS, MASTER_INTERNAL_IPS)
2. Update the ClusterLoader2 code to change the names from singular to plural (MASTER_IP -> MASTER_IPS), see TODOs in Make CL2 accept multiple master ips. #544
3. Clean up k8s.io/test-infra to stop setting singular name variables (if cl2 is the only binary reading that env).

[jukie]

Do the gcloud calls return all of the needed ip's or should I be adding a loop to handle that?
https://github.com/kubernetes/test-infra/blob/ef83ebe5d17630bd608d618ae89bfec1c0f35842/kubetest/e2e.go#L606-L611

	masterIP, err := control.Output(exec.Command(
		"gcloud", "compute", "addresses", "describe",
		os.Getenv("MASTER_NAME")+"-ip",
		"--project="+o.gcpProject,
		"--region="+o.gcpZone[:len(o.gcpZone)-2],
		"--format=value(address)"))

https://github.com/kubernetes/test-infra/blob/ef83ebe5d17630bd608d618ae89bfec1c0f35842/kubetest/e2e.go#L624-L629

	masterInternalIP, err := control.Output(exec.Command(
		"gcloud", "compute", "instances", "describe",
		os.Getenv("MASTER_NAME"),
		"--project="+o.gcpProject,
		"--zone="+o.gcpZone,
		"--format=value(networkInterfaces[0].networkIP)"))

I'm mostly familiar with AWS, but I'm curious if the following needs to be modified to loop over every interface:
"--format=value(networkInterfaces[0].networkIP)"))

[jukie]

• Add plural variables to k8s.io/test-infra
• Update CL2 to use the new variables
• Cleanup k8s.io/test-infra

[fejta-bot]

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/lifecycle stale

[wojtek-t]

/remove-lifecycle stale

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/lifecycle stale

[mm4tt]

/remove-lifecycle stale

There are WIP (but unfortunately, not active) PRs for this. If anyone else would like to take over the work here, please let me know.

[fejta-bot]

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/lifecycle stale

[wojtek-t]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[wojtek-t]

/remove-lifecycle stale

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/lifecycle stale

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/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

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[wojtek-t]

/remove-lifecycle rotten

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/lifecycle stale

[wojtek-t]

/remove-lifecycle rotten

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/lifecycle rotten

[wojtek-t]

/remove-lifecycle rotten

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This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

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/lifecycle rotten

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• After 90d of inactivity, lifecycle/stale is applied
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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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You can:

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Please send feedback to sig-contributor-experience at kubernetes/community.

/close

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