[libvirt] node device libudev backend second look

[Dave Allan]

Attached is a patch against the current head containing an 
implementation of node device enumeration using libudev.  It is complete 
except for the monitor, but I'm submitting it now as I have a few 
questions about the implementation that I'd like advice on.  They are 
marked XXX in comments in the patch.

The other thing that's not clear to me is how the code generates the 
tree structure for nodedev-list --tree.  I'm setting the parent pointer 
to what I think is correct, but the tree output is broken.  I can dig 
through it until I understand it, but if anyone is familiar with the 
implementation and would be willing to take a few minutes to walk me 
through it, it would save me a bunch of time.

I think it's also important that people get the code installed on a 
variety of systems as soon as possible to shake out the inevitable bugs 
that will arise from differing device models and code versions, and I'll 
have the final version with the monitor shortly.

Dave
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