shutdown the session async executor to cleanup useless threads

weboob/browser/browsers.py

@@ -118,6 +118,9 @@ class Browser(object):
         if isinstance(self.VERIFY, basestring):
             self.VERIFY = self.asset(self.VERIFY)
 
+    def deinit(self):
+        self.session.close()
+
     def load_state(self, state):
         if 'cookies' in state:
             try:

weboob/browser/sessions.py

@@ -150,3 +150,8 @@ class FuturesSession(WeboobSession):
             return self.executor.submit(func, *args, **kwargs)
 
         return sup(*args, **kwargs)
+
+    def close(self):
+        super(FuturesSession, self).close()
+        if self.executor:
+            self.executor.shutdown()