The server management libraries broke because of a puppet directory rename.

Allen found the that the problem is in:
  venv/server_management_lib/constants.KEY_FILENAME

I updated that value locally and went looking for where to add a test to catch problems in the future before they are submitted.

But I can't seem to find the unittests for the server management library. If they exist, can you add instructions for running them to the README?

If not.... we need some. At least enough to catch syntax errors and to give us a place to add tests over time as things break. I can help make sure they are run on builders before changes are submitted.