This eliminates all remaining references to AWS SDK v1 in the
lib/srv/db/... and lib/srv/discovery/... packages.
Most of the changes are simply to remove dead code.
Calling the AWS API `ecs:ListServices` with a non-existent ECS Cluster
name will return a 400 w/ ClusterNotFoundException.
The existing code was not handling that error and a raw error was
returned.
This PR changes the logic to ensure that case is handled and that the
ListDeployedDatabaseServices returns an empty list.
An alternative would be to call the ListClusters beforehand, but that
would increase the number of API calls we do to external services.
* migrate aws configurator to sdk v2
* rename package imports with lowercase
* export iam client interface
* mock loading aws config
* remove underscore from test name
* remove loop var reassignment
Gavin Frazar