Michael Marineau e77e4e5499 disk_layout: Align disk sizes to both 1MB and cylinder boundaries.
The VHD disk format internally includes CHS addressing and qemu-img
respectfully aligns disk images to the common 16 heads 63 sectors
geometry when possible. This is unfortunate since images uploaded to
Azure must also be aligned to 1MB we normally do.

Since qemu-img doesn't have a way to handle this well right now adjust
our existing alignment logic to create disk images aligned to both.
2014-10-08 20:40:45 -07:00
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