Re: [libvirt] [PATCH 2/5] conf: Introduce raw disk string passthrough

This patch adds a new disk type "raw" that can be used twofold: 1) To pass arbitrary strings as disk sources to the hypervisor of choice. This allows to use not-yet-supported storage specification formats. 2) To return backing chain element names that libvirt doesn't yet know how to parse. Backing chain elements may specify names that libvirt isn't able to parse. To allow us reporting it back to the user, unparsable strings will be reported as disk type="raw". To avoid attempts to label or do other operations on "raw" disks mark them as remote and unsupported by the storage driver explicitly. Tests for the new format are being added separately.