remove_priority
Description:
Removes the priority map at index idx from the NMSettingVlan:ingress_priority_map or 
        NMSettingVlan:egress_priority_map properties.
Parameters:
| this | 
           the SettingVlan  | 
      
| map | 
           the type of priority map  | 
      
| idx | 
           the zero-based index of the priority map to remove  |