Automatic merge from submit-queue
Add NetworkPolicy API Resource
API implementation of https://github.com/kubernetes/kubernetes/pull/24154
Still to do:
- [x] Get it working (See comments)
- [x] Make sure user-facing comments are correct.
- [x] Update naming in response to #24154
- [x] kubectl / client support
- [x] Release note.
```release-note
Implement NetworkPolicy v1beta1 API object / client support.
```
Next Steps:
- UTs in separate PR.
- e2e test in separate PR.
- make `Ports` + `From` pointers to slices (TODOs in code - to be done when auto-gen is fixed)
CC @thockin
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