Remove set -x from scripts.

[funman]

This disables printing commands and their arguments as they are executed. This cuts down on log spam e.g. in journalctl -f, even though it can be mitigated with snap stop cups.

Oct 12 12:01:39 big cups.cups-browsed[12202]: + [ -r /var/snap/cups/1262/var/run/cupsd.pid ]
Oct 12 12:01:39 big cups.cups-browsed[12263]: + cat /var/snap/cups/1262/var/run/cupsd.pid
Oct 12 12:01:39 big cups.cups-browsed[12202]: + PID=3029
Oct 12 12:01:39 big cups.cups-browsed[12202]: + [ -n 3029 ]
Oct 12 12:01:39 big cups.cups-browsed[12202]: + kill -0 3029
Oct 12 12:01:39 big cups.cups-browsed[12202]: + sleep 1
Oct 12 12:01:40 big cups.cups-browsed[12202]: + [ -r /var/snap/cups/1262/var/run/cupsd.pid ]
Oct 12 12:01:40 big cups.cups-browsed[12266]: + cat /var/snap/cups/1262/var/run/cupsd.pid
Oct 12 12:01:40 big cups.cups-browsed[12202]: + PID=3029
Oct 12 12:01:40 big cups.cups-browsed[12202]: + [ -n 3029 ]
Oct 12 12:01:40 big cups.cups-browsed[12202]: + kill -0 3029
Oct 12 12:01:40 big cups.cups-browsed[12202]: + sleep 1

[tillkamppeter]

The -x was there for debugging during the devlopment. It would be great if one could add somewhere, in a config file for example, a global "debug mode" switch to turn on and off the -x switch for all scripts at once.

Also, the tests for standalone mode are failing.

[funman]

What about something like:

[ -n "$CUPS_DEBUG" ] && set -x

I noticed the tests failing but I don't understand if this is caused by my change or due to external causes.