* update ec2_vpc_subnet_facts module to use boto3 and support gathering updated fact items from AWS API
add version_added to new parameter
added return docs and other requested changes
removed errant extra blank line
updates per review
* update per review: fix AWSRetry backoff implementation and fix example that was not correct
Changes to the metadata format were approved here:
https://github.com/ansible/proposals/issues/54
* Update documentation to the new metadata format
* Changes to metadata-tool to account for new metadata
* Add GPL license header
* Add upgrade subcommand to upgrade metadata version
* Change default metadata to the new format
* Fix exclusion of non-modules from the metadata report
* Fix ansible-doc for new module metadata
* Exclude metadata version from ansible-doc output
* Fix website docs generation for the new metadata
* Update metadata schema in valiate-modules test
* Update the metadata in all modules to the new version