[sheepdog] download vdi via object storage

[Maxim Terleckiy]

I tried to use writethrough, but vms always died with qemu exceptions(qemu
1.5-2.1, sheep 0.8.0) after some minutes/hours/days of work. After that,
during one year, I used writeback without any visible problems with data
consistency on over 300 images with regular compute nodes crashing(hw/power
failures). Just remember to clear object cache directory before starting
sheep process at crashed node if you already redeployed vms from that node
to others.
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