yum changed the callback info

It used to give us (x/y) packagename, but now it only sends package
name. This was changed in yum commit 7e8c76173. For now default to
showing the zeros along with the package name so that it doesn't look
like an error.

src/pylorax/yumhelper.py

@@ -50,7 +50,7 @@ class LoraxDownloadCallback(yum.callbacks.DownloadBaseCallback):
 
         pkgno = 0
         total = 0
-        pkgname = "error"
+        pkgname = name
         if match:
             pkgno = int(match.group("pkgno"))
             total = int(match.group("total"))