loongson/pypi: links for link-etcd

loongson/mirror link.etcd-0.4.tar.gz
loongson/mirror link.etcd-0.4-py3-none-any.whl
loongson/mirror link.etcd-0.3.tar.gz
loongson/mirror link.etcd-0.2.tar.gz
loongson/mirror link.etcd-0.1.tar.gz