第二章里面etcd安装，最新版etcd3.5.4

[Ricardo-wd]

最新版etcd3.5.4的参数配置改成如下，可run
#!/bin/sh
./etcd --name etcd-server-7-21
--data-dir /data/etcd/etcd-server
--listen-peer-urls https://10.4.7.21:2380
--listen-client-urls https://10.4.7.21:2379,http://127.0.0.1:2379
--quota-backend-bytes 8000000000
--initial-advertise-peer-urls https://10.4.7.21:2380
--advertise-client-urls https://10.4.7.21:2379,http://127.0.0.1:2379
--initial-cluster etcd-server-7-12=https://10.4.7.12:2380,etcd-server-7-21=https://10.4.7.21:2380,etcd-server-7-22=https://10.4.7.22:2380
--trusted-ca-file ./certs/ca.pem
--cert-file ./certs/etcd-peer.pem
--key-file ./certs/etcd-peer-key.pem
--client-cert-auth
--trusted-ca-file ./certs/ca.pem
--peer-cert-file ./certs/etcd-peer.pem
--peer-key-file ./certs/etcd-peer-key.pem
--peer-client-cert-auth
--peer-trusted-ca-file ./certs/ca.pem
--log-outputs stdout