When executing `false || (echo bad; exit 1)`, the call to `exit` won't
exit the script, it will only exit the subshell and the exit code will
be stored in the return code `$?`.
Since this is an error, we have to exit the script properly.
The sysconfig file now only contains the defaults as comments, changes
made there are given to the init.d script, prepare-dirs, safe-reload and
Icinga 2 itself. If nothing is set in the sysconfig file (as is the
default as all lines are commented out) the defaults are used.
fixes#6255