Automatic merge from submit-queue (batch tested with PRs 51321, 55969, 55039, 56183, 55976). 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>.
Kubectl apply and strategic merge patch using openapi
- [x] support openapi in strategic merge patch
- [x] test openapi in strategic merge patch
- [x] kubectl apply use openapi to calculate diff be default. It will fall back to use baked-in types when openapi is not available.
- [x] test openapi in kubectl apply
Fixes: kubernetes/kubectl#55
```release-note
kubectl apply use openapi to calculate diff be default. It will fall back to use baked-in types when openapi is not available.
```
/assign @apelisse
Kubernetes-commit: e412ad5393b8c949474b904616fc411c3aa478a9
