snapshot: add virsh domblklist command
This adds a convenience function to virsh that parses out block information from the domain xml, making it much easier to see what strings can be used in all other contexts that demand a specific block name, especially when given the previous patch that allows using either target or unique source name. As an example on a domain with one disk and an empty cdrom drive: Target Source ------------------------------------------- vda /var/lib/libvirt/images/fedora_12.img hdc - * tools/virsh.c (cmdDomblklist): New function. * tools/virsh.pod (domblklist): Document it.
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