* IAM User Cloudformation Enhancements: update, delete, getatt.
* AWS::IAM::Policy Support
* Added unit tests for AWS:IAM:Policy for roles and groups. Fixed bug related to groups.
* AWS:IAM:AccessKey CloudFormation support.
* Refactor of CloudFormation parsing.py methods to simplify and standardize how they call to the models. Adjusted some models accordingly.
* Further model CloudFormation support changes to align with revised CloudFormation logic. Mostly avoidance of getting resoure name from properties.
* Support for Kinesis Stream RetentionPeriodHours param.
* Kinesis Stream Cloudformation Tag Support.
* Added omitted 'region' param to boto3.client() calls in new tests.
Co-authored-by: Joseph Weitekamp <jweite@amazon.com>
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