unregister atexit on APISession:logout

Do not SMlog information when __del__ is called and the session has already been closed.

Signed-off-by: Arnaud Garcia-Fernandez <arnaud.garcia-fernandez@vates.tech>

Author: Ythogtha

drivers/util.py

@@ -719,14 +719,18 @@ def login(self):
             raise xs_errors.XenError(msg) from exc
         return session
 
-    def logout(self, log="logout"):
+    def _logout(self, log):
         if self.session is None:
             SMlog("APISession [{}] session is None {}".format(self.originator, log))
             return
         self.session.xenapi.session.logout()
         SMlog("APISession [{}] {}".format(self.originator, log))
         self.session = None
 
+    def logout(self, log="logout"):
+        atexit.unregister(self.atexit)
+        self._logout(log=log)
+
     def __del__(self):
         """Closes an API session"""
         atexit.unregister(self.atexit)