Instance launched on proxmox host is losing network connectivity

### problem

The instance launched on proxmox host is losing network connectivity

### versions

ACS 4.21

### The steps to reproduce the bug

Steps to reproduce the issue

1. Launch a vm in proxmox via cloudstack extension
2. The vm gets a ip from cloudstack vrouter
3. Stop the vm
4. Vr goes into shutdown in Cloudstack
5. Start the vm frm clodustack
6. The virtual router starts but vm doesn't get a IP address assigned

### What to do about it?

The vm should get a ip address assigned when the vr is rebooted

首先在 Proxmox CloudStack 扩展中复现报告的生命周期：启动一个 VM，将其停止，让虚拟路由器关闭，然后从 CloudStack 再次启动 VM。确认虚拟路由器会重启，但 VM 不会获得 IP 地址；完成标准是 VM 在路由器重启后获得 IP 地址。

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