Fix a problem, when there are multiple running operations in GKE

[loburm]

There are might be multiple ongoing operations in GKE. Current code expects only one, so when multiple operations are returned it waits for the finish of non-existing operation and Down function fails.

With this fix we are going to wait for each operation to finish before continuing execution.

[k8s-ci-robot]

Hi @loburm. Thanks for your PR.

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[wojtek-t]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: loburm, wojtek-t

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[k8s-ci-robot]

@loburm: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-test-infra-unit-test	7ae9efc	link	true	/test pull-test-infra-unit-test
pull-test-infra-unit-test-race-detector-nonblocking	7ae9efc	link	false	/test pull-test-infra-unit-test-race-detector-nonblocking

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[loburm]

/retest

[k8s-ci-robot]

@loburm: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[k8s-triage-robot]

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/lifecycle stale

[k8s-triage-robot]

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

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

This bot triages 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
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Reopen this PR with /reopen
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/close

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