Comment 8 for bug 1573030

Reviewed: https://review.openstack.org/310542
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-rabbitmq_server/commit/?id=5dc67955f0ac08a7c9719d641e9828558620da89
Submitter: Jenkins
Branch: master

commit 5dc67955f0ac08a7c9719d641e9828558620da89
Author: Darren Birkett <email address hidden>
Date: Thu May 5 22:36:34 2016 +0100

    install rabbitmq-server in serial

    In order to prevent race conditions with nodes joining the cluster
    simultaneously when the cluster is first formed, we move the rabbitmq
    installation play to be 'serial: 1'. However, when the nodes are being
    upgraded, it cannot be done in serial so in this case we set 'serial: 0'

    The tests are removed from a post_task include in the install play, and
    moved to their own play as they need to be run after the entire cluster
    has been formed. As well as moving a few generic vars into the
    test-vars.yml include, we also pass in the specific version of rabbitmq
    to be tested against in the test play.

    Fixes-Bug: #1573030

    Change-Id: Id119ff9f20ddfd8e1f29598c8c5ce862d2e7fab4