TODO
----

  1. Test and support more file system types.  Actually this should be
    pretty simple now that the parameters are stored in the configuration
    hash.  The only issue is that trailing whitespace is missing from the
    "make_fs_foo" option.

  2. Write more test cases.

  3. LVM snapshot support as an install source.

  4. xen-delete-image should unallocate any used IP addresses.

Steve
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