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 josh@sysmgr.org