UUID.from_json(['named-uuid', 'x'], None) should raise an error about
invalid syntax, but instead it was raising a TypeError because it would
try to evaluate "'x' not in None". This fixes the problem and adds a test.
These initial bindings pass a few hundred of the corresponding tests
for C implementations of various bits of the Open vSwitch library API.
The poorest part of them is actually the Python IDL interface in
ovs.db.idl, which has not received enough attention yet. It appears
to work, but it doesn't yet support writes (transactions) and it is
difficult to use. I hope to improve it as it becomes clear what
semantics Python applications actually want from an IDL.
