Log Message:
py-daemon: updated to 2.2.0

Version 2.2.0

Bug Fixes:
* Correct the description of the return value for
  daemon.is_detach_process_context_required.
* Set a sensible default for Distribution.script_name.
  This works around a bug in Setuptools which calls commands before
  the Distribution is initialised.

Changes:
* The test suite now relies on the test discovery feature in
  ‘unittest’. This feature is in Python version 2.7 and later.
* Improve performance of daemon.close_all_open_files.