Some commands used in tests are Linux specific and do not exist
or do not behave the same on Windows nodes. This can cause those
tests to fail on Windows nodes.
Replaces the mentioned commands with ones that behave the same on
both Linux and Windows.
Use the same pattern everywhere in the e2e test
harness, use busybox (from dockerhub) instead
of using the one from k8s.gcr.io registry.
Change-Id: I57c3b867408c1f9478a8909c26744ea0368ff003
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
NetworkPolicy e2e: use ClientSet and update to CoreV1 and NetworkingV1 apis.
**What this PR does / why we need it**:
Update NetworkPolicy e2e test: use the public ClientSet and update to CoreV1 and NetworkingV1 apis.
**Release note**:
```release-note
NONE
```