Adding kms support and moving to aws sdk 1.9.7

@mcohen01 

This PR adds support for the new AWS Key Management Service.

To provide support, I revved the version of the AWS sdk to 1.9.7.

It includes basic tests that I created based on reading other service test.  The test will

* create key
* list keys
* disable the key

Please let me know your thoughts / feedback.