Finished e2e-test #1

[knee-berts]

What type of PD is this? /kind cleanup /kind e2e-test /kind needs-kind

What this PD does / why we need it: Closes #15 Added a method to e2etests that collects destination pods IP via k8s downward api. Added a method that emulates kubectl exec command and returns stdout. Runs each test (TCP and UDP) 50 times and validates that the Pod IP returned in the test is the destination pod IP. Pinned kind configs to a version where endpointslices are Beta.

[k8s-ci-robot]

@knee-berts: The label(s) kind/e2e-test cannot be applied, because the repository doesn't have them.

In response to [this](https://github.com/kubernetes-sigs/mcs-api/pull/18): >What type of PD is this? >/kind cleanup >/kind e2e-test > >What this PD does / why we need it: >Closes #14 >Added a method to e2etests that collects destination pods IP via k8s downward api. >Runs each test (TCP and UDP) 50 times and validates that the Pod IP returned in the test is the destination pod IP. >Pinned kind configs to a version where endpointslices are Beta. 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.

[k8s-ci-robot]

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[lauralorenz]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knee-berts, lauralorenz

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/mcs-api/blob/master/OWNERS)~~ [lauralorenz] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment