[Samba] Samba4 changing a user's password from linux workstation

[Julien TEHERY]

I've gotten pretty unhappy with "realmd" and "sssd". They try to hide
>> a lot of steps away from the user, but the internal interactions are a
>> bit of a "mousetrap" game. When it works, you get the mouse. But if
>> any of the many steps are even slightly worn, it becomes erratic or
>> fails.
>>
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Update: In fact i succeeded in reseting user password from a linux 
workstation with kpasswd through pam_sssd.
At the beginning I thought we were prompted directly for new password, 
but we had to first type in the old one before choosing a new one.