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fix: prevent max listeners warning

If establishing a database connection is slow
and database migration runs and there are many
models, sql operations are queued up and this
leads to the node.js max emitters exceeded
warning.

A default value for max emitters has now
been introduced, and it can also be configured
in datasources.json.

Signed-off-by: Dominique Emond <dremond@ca.ibm.com>

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