[libvirt] [PATCH 5/5]: Export <device> when doing logical pool discovery

[Chris Lalancette]

When doing logical pool discovery, it currently returns XML like:

<sources><source><name>myvg</name></source></sources>

However, for oVirt, we need to know the device name that corresponds to this
logical volume group as well.  Therefore, extend the
virStorageBackendLogicalFindPoolSources function to return this information as
well.  This required pretty much a complete rewrite of the discovery function,
since I needed to be able to add <device> sections to already existing XML
nodes.  For that reason, this code uses direct libxml2 tree API's to handle the
parsing and the adding of nodes where necessary.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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