Release/1.15.1

[lmarini]

1.15.1 - 2021-03-12

Fixed

• Several views were throwing errors trying to access a None value in EventSinkService when a user was not logged in.
  Replaced get() with getOrElse().
• Consolidated field names sent by the EventSinkService to maximize reuse.
• Changed EventSinkService logging to debug to minimize chatter.
• Don't automatically create eventsink queue and bind it to eventsink exchange. Let clients do that so that we don't
  have a queue for the eventsink filling up if there are no consumers.

[max-zilla]

Ran and verified new category field for events, didn't encounter issues. Didn't catch anything in code.

[bodom0015]

RabbitMQMessageService.submit(exchange: String, routing_key: String, message: JsValue, exchange_type: String = "topic") now accepts a routing_key that represents a queue that may not exist.

[bodom0015]

LGTM, aside from the issue noted below. If we're moving RabbitMQ to a hard requirement then please disregard, but I don't recall that being part of the discussion of these feature.