For pulp-manage-db prerequisites: Add pulp_streamer to list of services that should not be running
https://github.com/pulp/pulp/pull/2903/files has docs/user-guide/release-notes/2.12.x.rst changes which list the other services but omit pulp_streamer.service:
"``pulp-manage-db`` will not continue if pulp_celerybeat, pulp_resource_manager, or pulp_workers
+ processes are running. This will prevent the user from corrupting their Pulp installation by
+ migrating with running workers. This works in both standalone and clustered installations. Pulp
+ may wait up to 92 seconds to determine if workers are running."