get_priority_group_id
Description:
Parameters:
| this | 
           the SettingDcb  | 
      
| user_priority | 
           the User Priority (0 - 7) to retrieve the group ID for  | 
      
Returns:
| 
           the group number   | 
      
| this | 
           the SettingDcb  | 
      
| user_priority | 
           the User Priority (0 - 7) to retrieve the group ID for  | 
      
| 
           the group number   |