Service management of Sage - D

[lingu]

It seems to be quite complex. Do we need to really pay that complexity? If so, please let me know and I'll review the design in detail.

Here is what I think we can do:

1. Start/stop sage using the current way (start.sh and kill).

2. An operative user may not be able to run start.sh and kill as the user 'sage'. Hence, there should be some mechanism. For example, can we create a user 'gladsage' whose login shell is a command that uses a key file to login as sage and run start.sh or kill.