https://www.pivotaltracker.com/story/show/79696750

Added to the dictionary of NRPE states with 'known' pending states (stop/start/restart) and updated tests.
Was not rebased on master for initial branch due to stale local copy, hence duplicate commits.
Given that three status codes were added and the logic to process them is not common, each is a unique lookup, it would be better to add a test for each of the new states to make sure no one breaks these states in the future with a typo etc.