Fix debug parameter

-d was removed from cdist in favor of mulitple -v and -l parameters, but
-d was not removed from preos.

Resolve #849.
3 jobs for bugfix/preos-debug in 1 minute and 17 seconds (queued for 13 seconds)
latest
Status Job ID Name Coverage
  Test
passed #7574
pycodestyle

00:00:20

passed #7573
shellcheck

00:00:32

passed #7575
unit_tests

00:00:25