This patch introduces new xml elements under <blkiotune>,
we use these new elements to setup the throttle blkio
cgroup for domain. The new blkiotune node looks like this:
<blkiotune>
<device>
<path>/path/to/block</path>
<weight>1000</weight>
<read_iops_sec>10000</read_iops_sec>
<write_iops_sec>10000</write_iops_sec>
<read_bytes_sec>1000000</read_bytes_sec>
<write_bytes_sec>1000000</write_bytes_sec>
</device>
</blkiotune>
Signed-off-by: Guan Qiang <hzguanqiang@corp.netease.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
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