RFR: 8303229: JFR: Preserve disk repository after exit

[Erik Gahlin]

Hi,

Could I have a review of an enhancement that adds the option preserve-repository=true/false to -XX:FlightRecorderOptions and jcmd JFR.configure. When set to true, chunk files in the repository will not be removed by the JVM at exit.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Fix whitespace
 - Initial
 - Initial

Changes: https://git.openjdk.org/jdk/pull/13111/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13111&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303229
  Stats: 198 lines in 8 files changed: 157 ins; 1 del; 40 mod
  Patch: https://git.openjdk.org/jdk/pull/13111.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13111/head:pull/13111

PR: https://git.openjdk.org/jdk/pull/13111