Message logged when charm has 'identity-service' relation on OpenStack version >= Queens too terse

[Frode Nordahl]

When using OpenStack Queens and newer the ceilometer charm will never complete a 'identity-service' relation to Keystone.

The end user is expected to replace it with the 'identity-credentials' relation.

I suggest adding a more verbose warning-level log message stating this fact.

[Frode Nordahl (fnordahl)]

https://review.openstack.org/#/c/548016/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/548016
Committed: https://git.openstack.org/cgit/openstack/charm-ceilometer/commit/?id=8d3a868b64eac08ecda387f2763bae25d8e7c5f0
Submitter: Zuul
Branch: master

commit 8d3a868b64eac08ecda387f2763bae25d8e7c5f0
Author: Frode Nordahl <email address hidden>
Date: Mon Feb 26 12:20:09 2018 +0000

    Add warning-level log message for wrong identity relation

    For OpenStack versions >= Queens the Ceilometer Charm
    requires a 'identity-credentials' relation to Keystone
    and not a 'identity-service' relation.

    Log a warning-level verbose message when 'identity-service'
    relation is detected on a >= Queens deployment.

    Change-Id: I8e3ff1b899b877cd2870f4bbaaea155e4433c4f4
    Closes-Bug: #1751772