Nova Cell support creates potential ambiguous relations for legacy bundles

[Drew Freiberger]

During deployment of a bundle that included the following relationships against the 18.11 charms, I was notified of ambiguity due to the added amqp-cell and shared-db-cell interfaces on the nova-cloud-controller charm.

 - [ nova-cloud-controller, rabbitmq-server ]
 - [ nova-cloud-controller, mysql ]

While it is now best practice to use explicit interface names in bundles, anyone working with bundles with these implicit relations will experience a deployment problem against the 18.11 nova-cloud-controller charm.

These should be updated to reflect the following relation interface names in your bundle.

 - [ "nova-cloud-controller:amqp" , "rabbitmq-server:amqp" ]
 - [ "nova-cloud-controller:shared-db", "mysql:shared-db" ]

[Drew Freiberger (afreiberger)]

Addressing with charm-guide update for the 18.11 release notes.

https://review.openstack.org/#/c/619091/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/619091
Committed: https://git.openstack.org/cgit/openstack/charm-guide/commit/?id=95e03172642d4a9a0b31d42caaf03c839c0cee7e
Submitter: Zuul
Branch: master

commit 95e03172642d4a9a0b31d42caaf03c839c0cee7e
Author: Drew Freiberger <email address hidden>
Date: Tue Nov 20 14:15:45 2018 -0600

    Address known issue with ambiguous interfaces

    nova-cloud-controller now includes new amqp-cell and shared-db-cell
    interfaces which may cause ambiguous relation errors while deploying
    legacy bundles. Addressed in 18.11 release notes doc.

    Change-Id: I4cf4b2b8870fbc6eaa2c21fd20c9428e38cc28de
    Related-Bug: #1804301