[Virtio-fs] [virtiofsd-rs] MR merged: Add flags and options to be compatible with the C implementation (Part 1)

[virtiofs-bot at sinrega.org]

This patch series adds a number of command line flags and options to be compatible with the C implementation.

Those flags and options are added relying on `Clap/StructOpt`, so they are passed in a different way through the command line. After this MR and https://gitlab.com/virtio-fs/virtiofsd-rs/-/merge_requests/4 are merged, they'll be a second part that adds a  `-o` option that's parsed manually and brings full command line compatibility with the C implementation.
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https://gitlab.com/virtio-fs/virtiofsd-rs/-/merge_requests/37