[BugFix: ZSTACK-42809] return latest disk size
[BugFix: ZSTACK-42809] return latest disk size

Signed-off-by: Qun Li <1ea81f54854048d0a4d4fd61caceabb2a843281c@zstack.io>

zstackio/zstack-utility,zstackio/zstack-utility,zstackio/zstack-utility