RFR: CODETOOLS-7902900: jcstress: Sysfs topology parser should accept non-consecutive package IDs

[Aleksey Shipilev]

This is seen with AWS c6g instances:
  org.openjdk.jcstress.os.topology.TopologyParseException: Package IDs are not consecutive: [60]

jcstress currently falls back to the realistic CPU topology, but that would not hold for the future.

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Commit messages:
 - CODETOOLS-7902900: jcstress: Sysfs topology parser should accept non-consecutive package IDs

Changes: https://git.openjdk.java.net/jcstress/pull/32/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=32&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902900
  Stats: 1035 lines in 6 files changed: 1033 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/32.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/32/head:pull/32

PR: https://git.openjdk.java.net/jcstress/pull/32