Added in a small Java app that mimics a dropwizard application

dw_test deploys the java test app as part of its cookbook, and
minitest will run curl commands to check that the server starts
up, reads the proper app configurations, and returns responses.
Adding in the sample-app, which is a dropwizard like java service for testing
Fixed a race condition in the minitest

Sometimes a race condition can occur where the Java service is
in the process of starting up while Chef begins its minitest run.