Fix K8S cloudinit template

Author: fhofherr

e2etests/templates/cloudinit_k8s.txt.tpl

@@ -23,6 +23,7 @@ write_files:
     export HCLOUD_TOKEN={{.HcloudToken}}
   path: /root/.bashrc
 runcmd:
+- export HOME=/root
 - sysctl --system
 - apt install -y apt-transport-https curl
 - curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -