RFR: 8271232: JFR: Scrub recording data

[Erik Gahlin]

Hi,

Could I have review of an enhancement that allows .jfr files to be scrubbed for sensitive information, either by a call to `RecordingFile::write(Path, Predicate<RecordedEvent>) `or from command line with `jfr scrub`. For details, see CSR.

Testing: jdk/jdk/jfr + manual testing with a SPECjbb recording with all events enabled

Thanks
Erik

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Commit messages:
 - Fix whitespace
 - Test autogenerated filename
 - Fixes
 - Fixes
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/7548/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7548&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271232
  Stats: 2144 lines in 28 files changed: 1931 ins; 153 del; 60 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7548.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7548/head:pull/7548

PR: https://git.openjdk.java.net/jdk/pull/7548