Let's download the vanilla kubectl binary into `/usr/bin/`, as we need
to avoid hitting issues like:
```sh
error: open /etc/rancher/k3s/k3s.yaml.lock: permission denied
```
The issue basically happens because k3s links `/usr/local/bin/kubectl`
to `/usr/local/bin/k3s`, and that does extra stuff that vanilla
`kubectl` doesn't do.
Also, in order to properly use the k3s.yaml config with the vanilla
kubectl, we're copying it to ~/.kube/config.
Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
ada65b988a