We currently record child processes in resmoke.py to run the hang analyzer on them. After jasper, there will no longer be child processes of resmoke; we should instead store an explicit list of global pids in config.py from values returned by jasper (See self.pids in jasper_process.py).

AC:

• we should also write an integration test that starts a mock Jasper process and check that the pids are correctly added when the process is created and removed when the process terminates for all different stop() (in process.py) scenarios.