Changes:
Bugfix: Removed some hard-coded references to "klabuser" on hadoop,daytrader
and nullworkload VApps.
Bugfix: Fixed some bugs that were preventing the cbplotlib.R utility from
being run from an arbitrary directory.
Bugfix: The collection "reported_runtime_app_VM_metric_names_<hostname>"
collection in MongoDB was not being properly cleaned up by hard_reset