Fix swh indexer journal client service

It's no longer running since 06/2020.

This problem is 2-fold:

swh/devel/swh-indexer!457 (closed): It's a configuration loading problem. It does not read its configuration even when provided.
swh/devel/swh-indexer!458 (closed): The current indexer journal client implementation relies on the old origin_visit model with "status" field. As this no longer exists, the code needs to be modified to subscribe to origin_visit_status instead.

Migrated from T2814 (view on Phabricator)

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