* Created test for get_policy with AWS managed policy.
* Created failing test for get_policy_version with AWS managed policy.
* Updated AWS managed policies.
* Fixed failing tests.
* Fixed trying to compare datetime with string in test case.
* Fixed CreateDate of AWS managed policies overwritten by their version's CreateDate.
* Fixed and improved tests for managed AWS policies.
* Added test for AWS managed policy with v4 default version.
* Fixed not correctly returning dates for AWS managed policies.
* Adding owner-id/OwnerId to the AMI classes to allow the value to be specified to test filtering images based on owner.
* Added default AMIs and filtering by owner-id
* Fixed some tests
* Fixed more random tests
* Updated MANIFEST
* .
* append appropriate urls when scaffolding
* make dispatch for rest-api
* fix dispatch for rest-json
* fix moto/core/response to obtain path and body parameters
* small fixes
* remove unused import
* fix get_int_param
* fix scaffold
* fix formatting of scaffold
* fix misc
* escape service to handle service w/ hyphen like iot-data
* escape service w/ hyphen
* fix regexp to extract region from url
* escape service
* fix syntax
* skip loading body to json object when request body is None
