RFR: 8259774: Deprecate -XX:FlightRecorderOptions:samplethreads

[Erik Gahlin]

Hi,

Could I have a review of a removal of command line option that hasn't worked for the last five years. '

JDK 17 introduced .jfc options which allows the sampler to be disabled without a dedicated command line flag in native.

Testing: jdk/jdk/jfr + tier1 + tier2

Thanks
Erik

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Commit messages:
 - Update TestJcmdConfigure.java
 - Update man page
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/7018/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7018&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259774
  Stats: 84 lines in 12 files changed: 7 ins; 73 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7018.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7018/head:pull/7018

PR: https://git.openjdk.java.net/jdk/pull/7018