Add close() to _RetryBody.

Allows clients to give up on reading the rest of the server response,
if they so choose.

Change-Id: Iccc95b1b5e7d066470966ee0c62a3beb260846e5

swiftclient/client.py

@@ -273,6 +273,9 @@ class _ObjectBody(object):
     def __next__(self):
         return self.next()
 
+    def close(self):
+        self.resp.close()
+
 
 class _RetryBody(_ObjectBody):
     """