Fix image-create using pipelines

The return value of ImageManager._get_file_size() is passed on to
the glance server in the create api call.  Returning None causes
the server to reject the request as malformed.

Add dtroyer to AUTHORS

Change-Id: I02c90e2db5fbd1e49d1516550c806f26dae83fb9

AUTHORS

@@ -1,3 +1,4 @@
 Brian Waldon <bcwaldon@gmail.com>
 Jay Pipes <jaypipes@gmail.com>
 Monty Taylor <mordred@inaugust.com>
+Dean Troyer <dtroyer@gmail.com>

glanceclient/v1/images.py

@@ -110,7 +110,7 @@ class ImageManager(base.Manager):
                     # to pipe image data to the client, e.g.
                     # echo testdata | bin/glance add blah..., or
                     # that stdin is empty
-                    return None
+                    return 0
                 else:
                     raise