Outbox latency improvements#60

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Bruno-DaSilva wants to merge 2 commits intooutboxfrom

bd/outbox_performance

Commits on May 2, 2018

mm producer: only sleep if there were 0 records in the database last time
Bruno Da Silva
committed
Add pub/sub notifications to the outbox implementation so, when a new record is added to the messages table, the producer is notified
Bruno Da Silva
committed