红帽全球峰会15.7.7. 启用用户登录，从外部控制台访问虚拟机
logon 操作可让用户从 Red Hat Virtualization 环境外的控制台访问虚拟机。
此操作要求安装 rhevm-guest-agent-gdm-plugin 和 rhevm-guest-agent-pam-module 软件包，以及要在虚拟机上运行
ovirt-guest-agent 服务。
用户为虚拟机需要适当的用户权限，以便从外部控制台访问虚拟机。
例 15.53. 登录虚拟机
POST /ovirt-engine/api/vms/5114bb3e-a4e6-44b2-b783-b3eea7d84720/logon HTTP/1.1
Content-Type: application/json
Content-Length: 2
{}
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