Add --node-instance-group flag to ginkgo

[upodroid]

This should fix these failing tests:

https://testgrid.k8s.io/sig-cluster-lifecycle-kubeup-to-kops#ci-kubernetes-e2e-cos-gce-disruptive-canary&include-filter-by-regex=gcp

The tests with cloud-provider-gcp tag are missing the e2eskipper

[upodroid]

/cc @justinsb as we discussed in the office hours earlier today

[k8s-ci-robot]

@upodroid: GitHub didn't allow me to request PR reviews from the following users: discussed, the, office, as, we, in, hours, earlier, today.

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In response to this:

/cc @justinsb as we discussed in the office hours earlier today

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[upodroid]

/test pull-kops-kubernetes-e2e-cos-gce-serial

[k8s-ci-robot]

@upodroid: The following test 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-kops-kubernetes-e2e-cos-gce-serial	ecf212d	link	false	/test pull-kops-kubernetes-e2e-cos-gce-serial

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]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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