vfe-0.8

What's Changed

• vdpa/virtio: Fix add VF crash without adding PF first by @yajwu in #39
• vdpa/virtio: Fix wrong set vring base(used index) by @yajwu in #40
• app/vfe-vdpa: fix background running by @yajwu in #41
• vdpa/virtio: fix mem hotplug wrong queue disable by @yajwu in #42
• vhost: reduce memory footprint when IOMMU is disabled by @yajwu in #43

Full Changelog: vfe-0.7...vfe-0.8