illumos: add base illumos data

The family of illumos distributions ship mostly common kernel and core
userland components, rather like the BSDs.  The base OS currently
supports legacy Virtio Network and Block devices, as well as other basic
platform devices provided by QEMU/KVM, etc.  Other distributions may
provide more specific data, including media identification markers, at a
later time.

Signed-off-by: Joshua M. Clulow <>
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