* Fix publisher resource leak in librarian submit_document (#883)
Wrap pub.start()/pub.send() in try/finally to guarantee pub.stop() is
called on error. Remove unnecessary asyncio.sleep(1) kludge.
* Make Cassandra replication factor configurable (issue #787) (#887)
Add CASSANDRA_REPLICATION_FACTOR environment variable and
--cassandra-replication-factor CLI argument to cassandra_config.py.
Update all four table store constructors (ConfigTableStore,
KnowledgeTableStore, LibraryTableStore, IamTableStore) to accept
an optional replication_factor parameter and use it in keyspace
creation CQL queries.
Thread the replication factor through all service constructors:
Configuration, KnowledgeManager, Librarian, IamService, and
knowledge store Processor.
* Update tests
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Co-authored-by: gittihub-jpg <rico@springer-mail.net>
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