TRN-402 is complete and passes all tests.

Ticket https://jira2.iparadigms.com/browse/TRN-402 text:

Gocql has a retry policy feature: https://godoc.org/github.com/gocql/gocql#RetryPolicy
The queries we run are idempotent, and if the database is having problems we would generally rather retry (which could slow the app down) rather than just powering through like it does now.
We want to use the provided SimpleRetryPolicy with gocql with a default of 3 attempts for queries. This should apply everywhere, unless we find cases where retrying would not be the right thing to do.

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