Function route53_provider 

pub fn route53_provider(zone: &str, aws: &Arc<FakeAws>) -> Route53Dns

A Route53Dns backed by aws, wound down to test timings.

Retry backoff and the GetChange poll interval are milliseconds rather than the production hundreds of them: a test that drives a throttled call or a PENDING change through to its answer waits on the number of calls it takes, not on a clock.