Use ginkgo-2.1.5

[cybertron]

Looking to pull in the summary fix from https://github.com/onsi/ginkgo/commit/5cf23e264b07a4b6928b02798e594205db9eac89 so we always get summaries, even if there's only a single failure.

Is this a BUG FIX or a FEATURE ?:

Uncomment only one, leave it on its own line:

/kind bug /kind enhancement

What this PR does / why we need it:

Special notes for your reviewer:

Release note:

NONE

[cybertron]

/cc @dougsland

This may help us track down repeated failures in ci jobs. This way you can just check the summary to see if the same tests are failing each time.

[kubevirt-bot]

@cybertron: GitHub didn't allow me to request PR reviews from the following users: dougsland.

Note that only nmstate members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to [this](https://github.com/nmstate/kubernetes-nmstate/pull/1191#issuecomment-1581613193): >/cc @dougsland > >This may help us track down repeated failures in ci jobs. This way you can just check the summary to see if the same tests are failing each time. Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[qinqon]

/lgtm /approve

[kubevirt-bot]

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