Throttle

[ylwu-amzn]

1.Fix update action execution result bug;
2.Add integration test code change

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dbbaughe]

Unrelated to this specific PR, but:
Adding Throttling introduced an update to our mappings. We need to add "schema_version" to the mappings and set it to 1 with this update. And in the code if schema_version does not exist on the document we'll assume it's 0 (ie initial release/before throttling was added).

We also need to add a way to update the mappings on each cluster. Currently none of the index mappings will be updated since we only do that once on initial use of alerting.

All of this needs to happen ASAP before we cut a release for 7.0

[ylwu-amzn]

Create a new issue to track the schema versioning. #60

[jinsoor-amzn]

Thanks for the fix.