Automatic merge from submit-queue (batch tested with PRs 49107, 47177, 49234, 49224, 49227)

Move util/exec to vendor

Move util/exec to vendor.
Update import paths.
Update godep

Part of #48209

Associate PR against `k8s.io/utils` repo: https://github.com/kubernetes/utils/pull/5

```release-note
NONE
```

/assign @apelisse