only erasing cassandra and zookeeper data if the user asks for it
restructured terminate script to be more modular, and only erase data if the caller tells us to
extracted database priming to its own method, and erasing hosted app info on startup if existing data is present
not infinitely retrying to grab apps from other machines
setting log level to debug, since a later pull request is being worked on to set it to INFO if the user requests it
Merge pull request #636 from shatterednirvana/persistence-finally

Persists data across AppScale deployments (virt cluster only)