Merge changes from topic "ansible-helm3"

Merge changes from topic "ansible-helm3"

* changes:
  Run chartmuseum as a docker container
  Update 'helm deploy' failure criteria
  Fix kubeconfig file permissions
  Ensure k8s namespace for ONAP exists
  Customize helm "--timeout" option format if running helm v3
  Redirect chartmuseum stdout/stderr to /dev/null
  Drop DIND specific test env settings for 'rke' role/playbook
  Improve bin utils symlink creation logic
  Add test scenario for Helm v3
  Refactor Helm role test setup
  Add helm-push Helm v3 plugin to downloaded utilities list
  Fix Helm v3 data dir setup
  Add tasks to setup Helm v3 on infra node
  Add Helm v3 test scenario to rke playbook tests
  Change 'rke' role testing strategy
  Workaround RKE binary download issue
  Play 'chartmuseum' role in rke playbook if running with Helm v3
  Fix variable inclusion order in RKE playbook tests
  Add Helm v3.3.4 to the list of downloaded utilities
  Add 'chartmuseum' binary to downloaded utilities list
  Add Molecule test scenario to verify 'chartmuseum' role on Ubuntu
  Add 'chartmuseum' role
  Split Helm v2 setup to separate playbook
  Improve 'application' role test coverage