[Samba] provision's success output is going to stderr.

[Felipe_G0NZÁLEZ_SANTIAG0]

Hello pals, I'm working with Samba Version 4.3.11-Ubuntu. 
When I provision a server I catch the output of the 'samba-tool domain provision' command. To know if any error occurs I catch the message in stderr, BUT: the common success message of the provision command appears here, in stderr. 

On the other hand, stdout is empty!!! 

Any idea? 
Whay this happens? 

___________________________________________ 
Felipe_ González_Santiago 
Universidad_de_las_Ciencias_Informáticas 
Centro_de_Software_Libre 
La_Habana. CUBA 

"Remind yourself that you cannot fail at being yourself" 
Wayne Dyer