Allow QCOW2 format disks with backing files for hierarchical templates
Issue
When a template is created from a VM, the disks are always created as a complete copy of the disk. This is not very efficient for storage usage, and doesn't make use of the backing file, reducing cache efficiencies.
Environment
- Red Hat Enterprise Virtualization 3.x
- Red Hat Virtualization 4.x
- File based Storage Domains
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