sheepdog: pass copy_policy in the request

sheepdog: pass copy_policy in the request

Currently copy_policy isn't used. Recent sheepdog supports erasure coding, which
make use of copy_policy internally, but require client explicitly passing
copy_policy from base inode to newly creately inode for snapshot related
operations.

If connected sheep daemon doesn't utilize copy_policy, passing it to sheep
daemon is just one extra null effect operation. So no compatibility problem.

With this patch, sheepdog can provide erasure coded volume for QEMU VM.

Cc: Kevin Wolf <[email protected]>
Cc: Stefan Hajnoczi <[email protected]>
Signed-off-by: Liu Yuan <[email protected]>
Acked-by: MORITA Kazutaka <[email protected]>
Signed-off-by: Kevin Wolf <[email protected]>