volumes

Make Calico nodename overridable on bare metal

Update efk stack

allow for configurable openstack storage class

Add run_once to remove-node

Fix the Python and pip version flag in the README

Add manage swap on the worker node

Update kube-scheduler policy

Fixed "network_plugin" variable

Enable by default the kubelet token auth

Improve variable handling for disabling etcd events cluster

The README says to check if Python and pip are installed type:

```
python -v && pip -v
```

Lowercase `-v` is `--verbose`, uppercase `-V` is `--version`. The
command should be:

```
python -V && pip -V
```

* Limit the maximum number of revisions saved per helm release