Aquire reports success when write to S3 Fails

[jparr]

I configured .threatreponse.ini with an S3 bucket that does not exist and ran

ssm_acquire --instance_id i-XXXXXXX --region us-west-2 --acquire

The command reports success.

Expected behavior would be an error.

[andrewkrug]

This is a pretty easy story to write. We should validate that S3 bucket exists after role assumption and before acquisition. If the bucket does not exist Raise() a custom exception.

Additionally good house keeping would also be to Raise() a custom exception based on the SSM RunCommand exit code for the script. ( Should in theory exit -1 for this kind of thing ) You can parse the response and raise.