Python 3 fixes

docker/client.py

@@ -228,7 +228,10 @@ class Client(requests.Session):
 
     def _get_raw_response_socket(self, response):
         self._raise_for_status(response)
-        return response.raw._fp.fp._sock
+        if six.PY3:
+            return response.raw._fp.fp.raw._sock
+        else:
+            return response.raw._fp.fp._sock
 
     def _stream_helper(self, response):
         """Generator for data coming from a chunked-encoded HTTP response."""
@@ -264,7 +267,10 @@ class Client(requests.Session):
         socket = self._get_raw_response_socket(response)
 
         def recvall(socket, size):
-            data = ''
+            if six.PY3:
+                data = bytes()
+            else:
+                data = ''
             while size > 0:
                 block = socket.recv(size)
                 if not block: