* AnsibleAWSModule related cleanup - redshift
* Apply a backoff on modify_cluster to cope with concurrent operations
* Add AWS 'hacking' policy to allow creation of Redshift ServiceRole
* Adding the retry policies makes the redshift test suite more reliable
* fix parameters check and port module to boto3
* begin with integration tests
* allow redshift iam policy
* Wait for cluster to be created before moving on to delete it
* Allow sts credentials so this can be run in CI
Don't log credentials
ensure cluster can be removed
* - Replace DIY waiters with boto3 waiters
- test multi node cluster
* catch specific boto3 error codes
* remove wait from test
* add missing alias for shippable
* - Rework modify function.
- Default unavailable parameters to none.
- Add cluster modify test
* Ensure resources are cleaned up if tests fail
* Ensure all botocore ClientError and BotoCoreError exceptions are handled
