Generalize deployment tests

I generalized the deployment tests by removing all of the hard coded node names, ports, and nics, and instead imported them from a JSON file.  The JSON file's name is defined in deployment.cfg, and the file is used to populate information about the environment that the deployment tests will be run in.
This should probably raise an exception; we don't want this to silently fail (the point of tests is to fail *loudly*).