[Virtio-fs] [virtiofsd] MR opened: virtiofsd: Add capability to handle extended fuse init request

[virtiofs-bot at sinrega.org]

Fuse has extended fuse_init_in and changed fields in fuse_init_out struct. It was running out of feature flags and it added another 32 bit field. This MR adds infrastructure so that one can parse feature flags in newly added fields and add support for these new features.

Once this is merged, I plan to bring in support for SELINUX context setup on file creation.
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https://gitlab.com/virtio-fs/virtiofsd/-/merge_requests/94