Use thread-aware psycopg2 connection pooling for database access
This allows to use swh.storage with a modicum of concurrency
Test Plan
clearly, make test should still pass
Migrated from D325 (view on Phabricator)
Staging instance, all changes can be removed at any time
This allows to use swh.storage with a modicum of concurrency
clearly, make test should still pass
Migrated from D325 (view on Phabricator)