Merge branch 'release-0.54.0' into develop

* release-0.54.0:
  Bumping version to 0.54.0
  Update cloudfront model to the latest version
  Support cloudsearchdomain service
Update opsworks model to the latest version
Add DestinationRegion if user does not provide the value

This will also fix the case where a user is not doing a copy
of an encrypted snapshot, because DestinationRegion is not required.
Merge branch 'opsworks-update' into develop

* opsworks-update:
  Update opsworks model to the latest version
Update comments in tests to be accurate
Merge branch 'ebs-snapshot-dst-region' into develop

* ebs-snapshot-dst-region:
  Update comments in tests to be accurate
  Add DestinationRegion if user does not provide the value
Update models to latest version
Bumping version to 0.55.0
Merge branch 'release-0.55.0'

* release-0.55.0:
  Bumping version to 0.55.0
  Update models to latest version
  Update comments in tests to be accurate
  Add DestinationRegion if user does not provide the value
  Update opsworks model to the latest version