The task "Stopping all Monasca Grafana instances but the first node"
can fail with:
error while evaluating conditional (monasca_grafana_differs['result']): 'dict object' has no attribute 'result'
This is fixed by running this task on the same set of hosts than the
task defining monasca_grafana_differs, i.e. groups['monasca-grafana'].
Change-Id: I6ad0256fb2a3cdc91dddf441e5e1c41f4ac69017
Closes-Bug: #1907689