Makes stack-name's configurable in the pipeline
Makes stack-name's configurable in the pipeline

Since it is possible to run some of these stacks in the same aws account
we need to provide a way to differentiate the stack name for the account
used.

[#108585160](https://www.pivotaltracker.com/story/show/108585160)

pivotal-golang/s3cli,pivotal-golang/s3cli,pivotal-golang/s3cli,pivotal-golang/s3cli