dav_auth: write log message when password is changed

dav_auth/views.py

@@ -70,6 +70,7 @@ class SetPasswordView(auth_views.PasswordChangeView):
     def form_valid(self, form):
         r = super().form_valid(form)
         messages.success(self.request, _('Passwort gespeichert.'))
+        logger.info('Changed Password for user \'%s\'', self.request.user)
         if form.cleaned_data.get('send_password_mail', False):
             email = emails.PasswordSetEmail(self.request.user, form.cleaned_data['new_password'])
             email.send()