when use raw disks, some blocks is lost when caculate disk usable blocks
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Key: TS-954
URL: https://issues.apache.org/jira/browse/TS-954
Project: Traffic Server
Issue Type: Bug
Components: Cache
Affects Versions: 3.1.0
Environment: all when use raw disks
Reporter: weijin
when use raw disks, some blocks may be lost because the skip variable is in
bytes not in blocks.
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