Add E2E tests and example for VRFs

[andreaskaris]

Is this a BUG FIX or a FEATURE ?: /kind enhancement

What this PR does / why we need it: Create E2E tests and add an example for VRFs to make sure that the feature works.

Special notes for your reviewer: Reported-at: https://github.com/nmstate/kubernetes-nmstate/issues/847 Fixes: https://github.com/nmstate/kubernetes-nmstate/issues/847

Release note:

NONE

[kubevirt-bot]

Hi @andreaskaris. Thanks for your PR.

I'm waiting for a nmstate member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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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]

/test

[kubevirt-bot]

@qinqon: The /test command needs one or more targets. The following commands are available to trigger required jobs:

• /test pull-kubernetes-nmstate-docs
• /test pull-kubernetes-nmstate-e2e-handler-k8s
• /test pull-kubernetes-nmstate-e2e-operator-k8s
• /test pull-kubernetes-nmstate-unit-test

The following commands are available to trigger optional jobs:

• /test pull-kubernetes-nmstate-e2e-handler-k8s-future
• /test pull-kubernetes-nmstate-e2e-upgrade-k8s

Use /test all to run all jobs.

In response to [this](https://github.com/nmstate/kubernetes-nmstate/pull/1189#issuecomment-1567132386): >/test 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]

/test all

[qinqon]

/ok-to-test

[qinqon]

/retest

[andreaskaris]

nit doc: Can you add the example to https://github.com/nmstate/kubernetes-nmstate/blob/main/docs/examples.md ? the examples index is not dynamic

done :-)

[andreaskaris]

/retest

[qinqon]

The example is present at generated docs https://storage.googleapis.com/kubevirt-prow/pr-logs/pull/nmstate_kubernetes-nmstate/1189/pull-kubernetes-nmstate-docs/1663472420981313536/artifacts/gh-pages/examples.html#vrf

/lgtm /approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qinqon

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