[Libvir] [PATCH] Refactor xend_internal.c block device detection

[Richard W.M. Jones]

This patch is a little bit esoteric, but I need it for something I'm 
working on at the moment.

At the moment the code in xend_internal.c: xend_parse_sexp_desc parses 
the domain sexpr directly into XML.  This makes it rather hard to just 
get a list of block devices without repeating the same code.  So here 
I've factored out the common code for parsing block devices into a 
separate function and callback.

There are a couple of small changes that you should be aware of: (1) The 
<devices> list may be returned in a different order (specifically, block 
devices are always returned first).  (2) We iterate over the root nodes 
of the sexpr twice (once for block devices, once for vifs and vfbs). 
But the sexpr is small and in-memory so this shouldn't be a problem 
compared to having to do the HTTP request to xend to get it in the first 
place.

'make check' passes.

Rich.

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