Fix the fetch of the stream generator

glanceclient is changed so we need to support different styles of
fetching the stream generator. either next(obj) or obj.next()

Change-Id: I88b3485917649c06f724cdda288f91ab2e41ad66

freezer/utils/utils.py

@@ -242,6 +242,8 @@ class ReSizeStream(object):
             while not stop and len(self.reminder) < chunk_size:
                 try:
                     self.reminder += next(self.stream)
+                except TypeError:
+                    self.reminder += self.stream.next()
                 except StopIteration:
                     stop = True
             if stop: