replaces structlog with containerlog

[edaniszewski]

related to #384

the move to synse v3 including using structlog to get structured logging. the analysis in the above issue indicate that doing so added latency to requests.

containerlog was created as an opinionated structured logging library that is speedy, so replacing structlog with containerlog should reduce request latency.

as part of this work item, some latency tests should be run once replaced to verify that the request latency is reduced.