* AnsibleAWSModule related cleanup - s3_bucket
* Add extra information to s3_bucket timeout failures, it's possible the comparisons are doing something weird...
* Move Bucket Encryption boto support logic into the pre-flight checks
* Use the built in required_by logic
* Rework s3_bucket integration tests
* Add a retry around put_bucket_encryption
s3_client.put_bucket_encryption is occasionally dropped on the floor
by Amazon add some logic to retry s3_client.put_bucket_encryption call
* Catch OperationAborted and retry, it is caused by a conflicting change
still being in progress. (For example an Encryption setting applying)
* Make sure we don't explode if the botocore version's too old
* Review tweaks
