* ec2_group: add support for rule descriptions.
* Document rule description feature and add an example using it.
* Fix removing rule descriptions.
* Add integration tests to verify adding/modifying/removing rule descriptions works as expected.
* Add permissions to hacking/aws_config/testing_policies/ec2-policy.json for updating ingress and egress rule descriptions.
* ec2_group: add backwards compatibility with older versions of botocore for rule descriptions.
* Add compatibility with older version of botocore for ec2_group integration tests.
* ec2_group: move HAS_RULE_DESCRIPTION to be checked first.
* Make requested change
* Pass around a variable instead of client
* Make sure has_rule_description defaults to None
* Fail if rule_desc is in any ingress/egress rules and the the botocore version < 1.7.2
* Remove unnecessary variable
* Fix indentation for changed=True when updating rule descriptions.
* minor refactor to remove duplicate code
* add missing parameter
* Fix pep8
* Update test policy.
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