docker: Fix journal client services

Services acting as journal clients were always exiting prematurely due to not created kafka topics they were trying to subscribe to.

So ensure needed topics will be created when starting the kafka service and wait for their creation before starting the journal client services.

As a consequence, this makes a call to docker-compose up -d command a little bit longer before it returns.

Also fix a service configuration and enable DEBUG logging in another one (see commit log).

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Migrated from D5090 (view on Phabricator)

docker/conf/indexer_journal_client.yml

@@ -2,6 +2,7 @@ journal:
   brokers:
     - kafka
   group_id: swh.indexer.journal_client
+  prefix: swh.journal.objects
 
 max_messages: 50