Fix for #1815: make APIClient.stop honor container StopTimeout value

Signed-off-by: Damien Nadé <anvil.github@livna.org>

docker/api/container.py

@@ -1112,20 +1112,26 @@ class ContainerApiMixin(object):
                                 json=True)
 
     @utils.check_resource('container')
-    def stop(self, container, timeout=10):
+    def stop(self, container, timeout=None):
         """
         Stops a container. Similar to the ``docker stop`` command.
 
         Args:
             container (str): The container to stop
             timeout (int): Timeout in seconds to wait for the container to
-                stop before sending a ``SIGKILL``. Default: 10
+                stop before sending a ``SIGKILL``. If None, then the
+                StopTimeout value of the container will be used.
+                Default: None
 
         Raises:
             :py:class:`docker.errors.APIError`
                 If the server returns an error.
         """
-        params = {'t': timeout}
+        if timeout is None:
+            params = {}
+            timeout = 10
+        else:
+            params = {'t': timeout}
         url = self._url("/containers/{0}/stop", container)
 
         res = self._post(url, params=params,