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Handling of block device information and mapping.

This module contains helper methods for interpreting the block
device information and determining the suitable mapping to
guest devices and libvirt XML.

Throughout these methods there are a number of standard
variables / types used

 * 'mapping': a dict contains the storage device mapping.

   For the default disk types it will contain the following
   keys & values:

      'disk' -> disk_info
      'disk.rescue' -> disk_info
      'disk.local' -> disk_info
      'disk.swap' -> disk_info
      'disk.config' -> disk_info

   If any of the default disks are overridden by the block
   device info mappings, the hash value will be None

   For any ephemeral device there will also be a dict entry

      'disk.eph$NUM' -> disk_info

   For any volume device there will also be a dict entry:

       $path -> disk_info

   Finally a special key will refer to the root device:

      'root' -> disk_info


 * 'disk_info': a dict specifying disk configuration

   It contains the following 3 required fields

      bus (disk_bus), dev (disk_dev), type (device_type)

   and possibly these optional fields: ('format', 'boot_index')

 * 'disk_bus': the guest bus type ('ide', 'virtio', 'scsi', etc)

 * 'disk_dev': the device name 'vda', 'hdc', 'sdf', 'xvde' etc

 * 'device_type': type of device eg 'disk', 'cdrom', 'floppy'

 * 'format': Which format to apply to the device if applicable

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Identify a free disk dev name for a bus.

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