'Delete a keypair
:param key: The :class:`Keypair` (or its ID) to delete.
:returns: An instance of novaclient.base.TupleWithMeta'

@api_versions.wraps('2.0', '2.9')
def delete(self, key):

    return self._delete(('/%s/%s' % (self.keypair_prefix, base.getid(key))))
