[Virtio-fs] [virtiofsd-rs] MR merged: Enable back descriptor-utils tests

[virtiofs-bot at sinrega.org]

Create a temporary Queue with an avail ring added at the end of the
descriptors table to avoid using an internal vm-virtio API.

Fixes: https://gitlab.com/virtio-fs/virtiofsd-rs/-/issues/1
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https://gitlab.com/virtio-fs/virtiofsd-rs/-/merge_requests/50