add "Raid Set" status on areca that allow a disk in a raid to be OK

[kapouik]

On latest CLI tool from areca, I get a critical response whit two disk in a Raid 👍

  # Enc# Slot#   ModelName                        Capacity  Usage
===============================================================================
  1  01  Slot#1  SEAGATE ST1000NM0023             1000.2GB  Raid Set # 000  
  2  01  Slot#2  SEAGATE ST1000NM0023             1000.2GB  Raid Set # 000  
  3  01  Slot#3  N.A.                                0.0GB  N.A.      
  4  01  Slot#4  N.A.                                0.0GB  N.A.      
  5  01  Slot#5  N.A.                                0.0GB  N.A.      
  6  01  Slot#6  N.A.                                0.0GB  N.A.      
  7  01  Slot#7  N.A.                                0.0GB  N.A.      
  8  01  Slot#8  N.A.                                0.0GB  N.A.      
===============================================================================
GuiErrMsg<0x00>: Success.

My patch force to check if 'Raid Set' is present and declare OK.

[glensc]

tests missing. see CONTRIBUTING.md