Code review comment for lp://qastaging/~vishvananda/nova/no-db-messaging

Hey Vish,

So you latest fix resolves the RPC issues. Thanks!

I'm still hitting an issue with things like instance metadata (aka a model attributes that aren't columns).

The following changes to NovaBase.update resolves it for me.

            if key == 'name' and key in columns:
                setattr(self, key, value)
            else:
                setattr(self, key, value)