add foreground mode to aid systemd service

[robert-budde]

In order to use a very sleek systemd service sh.py should not fork while still being not too verbose on logging. Not forking allows systemd to monitor the process without using an additional pid-file.

[robert-budde]

Marcus, any thoughts on this one?

[encbladexp]

Maybe -f could be avoided. Example:

• -d runs sh.py in background, without verbose.
• -v runs sh.py in foreground, with verbose.
• -d -v runs sh.py in background, with verbose.
  Simply specifying nothing should run sh.py in foreground, without verbose mode enabled.

[robert-budde]

Sure. This would be the most straightforward way of doing things. But it would break compatibility with all existing installations.
I assume that this is not going to happen, therfore I proposed a less intrusive way.

[mknx]

Hi,

I will not merge changes to the base system, because I'm going to adapt the license. And if there are other contributors I cannot change it without asking them.

I'm going to send an email to the contributors/developers to discuss this topic.

Regards

Marcus