Return native connection object.

def _get_connection(self):
        """Return native connection object."""
        kwargs = {
            'username': self.account,
            'api_key': self.secret_key,
        }

        # Only add kwarg for servicenet if True because user could set
        # environment variable 'RACKSPACE_SERVICENET' separately.
        if self.servicenet:
            kwargs['servicenet'] = True

        if self.authurl:
            kwargs['authurl'] = self.authurl

        return cloudfiles.get_connection(**kwargs)