[sheepdog] [PATCH For SD and QEMU] Add discard/trim support for Sheepdog

[Liu Yuan]

From: Liu Yuan <tailai.ly at taobao.com>

Trim/discard is a command that allows VM to inform underlying storage system to
release unused space. Sheepdog takes use of this command to release unused
objects for better thin-provision.

This patch set aims to add trim/discard support to both Sheepdog and QEMU's
Sheepdog block driver.

There are first 3 patches for Sheepdog and the last one is for QEMU.

Thanks,
Yuan
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1.7.9.5