Major Description
Both SamzaAppMaster and SamzaContainer are hard to unit test. I ran into this as part of SAMZA-382, but it's a recurring problem. The issue is that we have a lot of logic in the main() method that's not mockable.
I think a good solution would be to write a helper class for things like environment variable, JmxServer, etc, and manage them all cleanly in an object that we can test, rather than in the main() method.