There is no record for why we implement the database creation outside
of the role in the playbook, when we could do it inside the role.
Implementing it inside the role allows us to reduce the quantity of
group_vars duplicated from the role, and allows us to better document
the required variables in the role. The delegation can still be done
as it is done in the playbook too.
In this patch we implement a new variable called 'keystone_db_setup_host'
which is used in the role to allow delegation of the database setup
task to any host, but defaults to the first member of the galera_all
host group. We also document the variable keystone_galera_address which
has been used for a long time, but never documented.
Update to use oslo.messaging service for RPC and Notify
This introduces oslo.messaging variables that define the RPC and
Notify transports for the OpenStack services. These parameters
replace the rabbitmq values and are used to generate the messaging
transport_url for the service. The association of the messaging
backend server to the oslo.messaging services will then be
transparent to the keystone service.
* Add oslo.messaging variables for RPC and Notify to defaults
* Update transport_url generation
* Update examples
* Add oslo.messaging to inventory
* Add release note
Also includes clean up of the pre-existing content.
Update the role documentation to match the newly proposed format. In
the new format, each role project should maintain the configuration
variations for the role project itself.