Bug: promenade helm stub does not allow helm interaction post-genesis

[alanmeadows]

It is not possible to interact with helm using the script provisioned by promenade:

clcp-demo-1:~$ helm ls
Unable to find image 'lachlanevenson/k8s-helm:v2.7.2' locally
v2.7.2: Pulling from lachlanevenson/k8s-helm
b56ae66c2937: Pull complete 
2474a3097697: Pull complete 
Digest: sha256:ce1986ec1a44480708f1bbc2b81a7d4fb89e178fb92bf08ec38ccf46f62020f0
Status: Downloaded newer image for lachlanevenson/k8s-helm:v2.7.2
Error: context deadline exceeded