Ubuntu24.04 ssh server配置的一些小变更

• 只能使用systemctl start ssh.service启动ssh server，sshd.service不再存在。
• 修改/etc/ssh/sshd_config中ssh server的默认端口号22后，使用systemctl restart ssh.service重启服务不会生效，必须使用systemctl daemon-reload和systemctl restart ssh.socket，配置文件注释部分有说明。

/etc/ssh/sshd_config

 14 # When systemd socket activation is used (the default), the socket
 15 # configuration must be re-generated after changing Port, AddressFamily, or
 16 # ListenAddress.
 17 #
 18 # For changes to take effect, run:
 19 #
 20 #   systemctl daemon-reload
 21 #   systemctl restart ssh.socket
 22 #