Merge branch 'release-0.45.0' into develop

* release-0.45.0:
  Bumping version to 0.45.0
  Update list of regions for cloudtrail
Update route53 model to the latest version
Add proper retry config for emr

Two issues:

* We need to use the proper endpoint prefix of "elasticmapreduce",
  not "emr".
* We need to use throttling_exception instead of the throttling
  rule for retry.
Update route53 model to the latest version
Merge branch 'update-route53' into develop

* update-route53:
  Update route53 model to the latest version
Update S3 model to the latest version
Bumping version to 0.46.0
Merge branch 'release-0.46.0'

* release-0.46.0:
  Bumping version to 0.46.0
  Update S3 model to the latest version
  Update route53 model to the latest version
  Add proper retry config for emr
  Update route53 model to the latest version