Comment 13 for bug 1714157

Reviewed: https://review.openstack.org/507042
Committed: https://git.openstack.org/cgit/openstack/charm-heat/commit/?id=a77b59dc2e72271c9bc7e82708ca5f36b6dd334b
Submitter: Jenkins
Branch: stable/17.08

commit a77b59dc2e72271c9bc7e82708ca5f36b6dd334b
Author: Alex Kavanagh <email address hidden>
Date: Thu Sep 21 12:11:17 2017 +0100

    Ensure auth_encryption_key is identical for all units

    This patch ensures that if multiple heat units are deployer, that each
    one will have the same auth_encryption_key in the /etc/heat/heat.conf.
    This is automatically generated on the (juju) leader and then remains
    unchanged for the application's duration. It can be overriden by the
    config setting 'encryption-key'.

    Testing is via the amulet 500 test (added) which checkes that the two
    units deployed have the same key.

    Change-Id: I89a11efe772314acd58ab9be21773eee89a23980
    Closes-Bug: #1714157
    (cherry picked from commit 275a8f61c69a435763f893c60335616db546423e)