Major Description
With the creation of example configurations, we made it really easy for users to get started. Unfortunately, we also took away the default nature to copy a configuration and move on. This can lead to problems when a user tried to run it out of the box without any sort of configuration. It will default to using 5 or 10g of memory total, without the user being aware of it until things start swapping.
Now that we have the sample configurations, if accumulo-env.sh isn't there, we should error out instead of poorly guestimating these values.