CA-173358: Change the unit of vbd-io-throughput data sources to MiB
CA-173358: Change the unit of vbd-io-throughput data sources to MiB

The unit of VBD IO throughput is changed to MiB after merged all
VBD related data sources from xcp-rrdd to rrdp-iostat,

Signed-off-by: Kaifeng Zhu <101c366863422798b95704fa46f7b4a7170761aa@citrix.com>

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