logwatch: mdadm status missing - Fix for Bug 12080

logwatch: mdadm status missing - Fix for Bug 12080

- Addition of mdadm module to logwatch
- Addition of logwatch to sudoers list to run mdadm commands
- patch to change logwatch mdadm.conf to allow scan for raid drives, change mdadm script
   to run mdadm scan commands with sudo, allow clean but degraded drives to be listed
   in the output.

Fixes: 12080
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>