fixed typo

lib/ansible/plugins/connections/__init__.py

@@ -130,7 +130,7 @@ class ConnectionBase(with_metaclass(ABCMeta, object)):
         return self.success_key in output
 
     def check_password_prompt(self, output):
-        if self.prompt in None:
+        if self.prompt is None:
             return True
         elif isinstance(self.prompt, basestring):
             return output.endswith(self.prompt)