Add Automation for generating the packstack man page

- packstack/installer/run_setup.py: Modified a little bit the printOptions()
  function to get a better rendering (more rst file friendly).
- docs/conf.py: The code added is largely inspired by the printOptions()
  function.
- This should definitely keep the man page synchronized with code !

Change-Id: I4b899d6b78be860da1ec05341e2f7a36a4c4f71c
Merge "Add Automation for generating the packstack man page"