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When calling destroyDevice code path (e.g. xm block-detach dom devid), allow specifying an integer device id or a device name such as xvdN or /dev/xvdN. Allowing the /dev/xvdN form is useful when detaching devices from dom0. Bootloaders may do this to unmount a disk previously mounted in dom0. Move examination of device ID format into the DevController, permitting device controllers to determine a valid device ID instead of higher level code. Signed-off-by: Jim Fehlig <jfehlig@novell.com>