Merge changes from topic "kube-prometheus-stack"

* changes:
  [ANSIBLE] Increase Helm install timeout for kube-prometheus application
  [ANSIBLE] Create a NodePort type service for Grafana dashboard
  [DOC] Add documentation for kube-prometheus stack
  [BUILD] Add Kube Prometheus Stack docker image list to default image list
  [BUILD] Add 'busybox' image to kube-prometheus data list
  [ANSIBLE] Update custom Grafana dashboard
  [ANSIBLE] Configure custom Grafana dashboard
  [ANSIBLE] Setup persistent volume for Grafana dashboards
  [TOOLS] Fix helm-healer.sh usage description
  [ANSIBLE] Add 'nfs' playbook
  [ANSIBLE] Generate helm values file for kube-prometheus stack
  [ANSIBLE] Create host paths for PVs and set their permissions
  [BUILD] Add the 'python2-openshift' package
  [ANSIBLE] Play the 'k8s-persistent-volume' role in 'kube_prometheus' playbook
  [ANSIBLE] Add 'k8s-persistent-volume' role
  [MOLECULE] Add setup for new 'k8s-persistent-volume' role
  [ANSIBLE] Setup kube-prometheus-stack role
  [MOLECULE] Setup Molecule for kube-prometheus-stack role
  [MOLECULE] Add prepare-kube-prometheus-stack role
  [ANSIBLE] Set default kube-prometheus-stack version
  [ANSIBLE] Add kube_prometheus playbook
  [ANSIBLE] Add 'kube-prometheus-stack' role skeleton
  [BUILD] Symlink kube-prometheus-stack tgz file while creating offline package
  [BUILD] Add kube-prometheus-stack helm chart package http resource url
  [BUILD] Add datalist file for kube-prometheus-stack

diff --cc tools/helm-healer.sh
Simple merge