[crac] RFR: 8347532: [CRaC] CRaCResetStartTime breaks cgroups caching

[Timofei Pushkin]

Changes the effect of `-XX:+CRaCResetStartTime` from resetting `os::elapsed_counter()` to affecting only `RuntimeMxBean.getUptime()` results.

-------------

Commit messages:
 - CRaCResetStartTime breaks cgroups caching

Changes: https://git.openjdk.org/crac/pull/182/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=182&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347532
  Stats: 47 lines in 11 files changed: 37 ins; 2 del; 8 mod
  Patch: https://git.openjdk.org/crac/pull/182.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/182/head:pull/182

PR: https://git.openjdk.org/crac/pull/182