[task #6584] Improve Xen support

[Samuel Thibault]

Follow-up Comment #4, task #6584 (project hurd):

Note: Keir just drop non-PAE support in the 3.3 branch, so we are stuck
with 3.0-3.2 until we implement PAE

In addition to the list: supporting partitions: in the configuration
file, one can say "hda1" instead of "hda", which means that we are
supposed to create an hd0s1 device instead of just hd0. This is done by
interpreting the vbd number as follows:

  202 << 8 | disk << 4 | partition      xvd, disks and partitions up to 15
    8 << 8 | disk << 4 | partition      sd, disks and partitions up to 15
    3 << 8 | disk << 6 | partition      hd, disks 0..3, partitions 1..63

i.e. hda1 gets number 769.

Support for more than 15 disks is not decided yet, will maybe just look
like 

  1 << 28 | disk << 8 | partition       xvd, disks or partitions 16 onwards


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