Fix Namespace.__repr__

The __repr__ in the recently added Namespace class is not able to
be used to reconstruct a a Namespace instance, as it pushed an
unexploded kwargs into the constructor, resulting in a variable
'kwargs' being stored in Namespace.info.

Change-Id: I41404c57e58cf80ea259924c1b07e7a397bf8324
Merge "Fix Namespace.__repr__"