This change upgrades the version of elasticsearch-curator because the
previous version (3.3.0) doesn't support Elasticsearch 2.x. As a
consequence, data older than the defined retention period was never
removed from Elasticsearch.
The curator is now installed on all the Elasticsearch nodes (previously
only on the primary node) and by configuration, it will only be
executed on the ES cluster master node.
Change-Id: I9da9e67fa4d353e78bd752456a9b01ca1fbae704
Closes-Bug: #1616765
Related-Bug: #1602719