Comment 2 for bug 1691510

Reviewed: https://review.openstack.org/467684
Committed: https://git.openstack.org/cgit/openstack/charm-rabbitmq-server/commit/?id=6a66fd16124c60d056fc710c1f47df6855c8ba1e
Submitter: Jenkins
Branch: master

commit 6a66fd16124c60d056fc710c1f47df6855c8ba1e
Author: Felipe Reyes <email address hidden>
Date: Wed May 24 12:22:37 2017 -0400

    Set clustered atrribute in the cluster's leader

    When forming the cluster the leader node (defined by
    leader_node_hostname) is the one that won't join a cluster, all the
    other peers will join this leader, this prevented the leader from
    setting the clustered attribute in the cluster relation.

    This patch makes all the units to run the cluster_with() function
    and cluster_with() skips 'rabbitmqctl join_cluster' for the nodes
    already present in the running section of 'rabbitmqctl cluster_status'
    and sets the clustered attribute if it hasn't been set already.

    Also cluster_with() is called within the upgrade-charm hook to allow
    existing deployments set the attribute if needed.

    Change-Id: I234046de279e1c28f7ad640c2cd7c641e864525b
    Closes-Bug: 1691510