'Notifies listener that process has died. This callback only
occurs for processes that die during normal process monitor
execution -- processes that are forcibly killed during
ProcessMonitor shutdown are not reported.
@param process_name: name of process
@type  process_name: str
@param exit_code: exit code of process. If None, it means
that ProcessMonitor was unable to determine an exit code.
@type  exit_code: int'

def process_died(self, process_name, exit_code):

    pass
