Automatic merge from submit-queue

Fixing the kubernetes-e2e charm README to use the containers namespace.

**What this PR does / why we need it**: The deploy command is not correct in the README.

**Which issue this PR fixes**: fixes https://github.com/juju-solutions/bundle-canonical-kubernetes/issues/251

**Special notes for your reviewer**: This is a text based change to the kubernetes-e2e charm README

**Release note**:
```release-note
NONE
```

A user pointed out the instructions in the kubernetes-e2e README were incorrect. Fixing that.