app/vfe-vdpa: add wait time after socket start #81
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When multiple VFs belong to single VM, QEMU handles the vhost-user message resend of devices one by one and the vhost fds close happen really quickly. This leads to downtime increase for VFs that restore late, as they need to wait for VFs driver ok on QEMU side. This commit fixes this issue by adding wait time per-VF.