RFR: 8265036: JFR: Remove use of -XX:StartFlightRecording= and -XX:FlightRecorderOptions=

[Erik Gahlin]

Hi,

Could I have a review of fix that removes the use of "=" together with -XX:StartFlightRecording and -XX:FlightRecorderOptions. It's been possible to use "-XX:StartFlightRecording:" and "-XX:FlightRecorderOption:" since JFR was introduced into OpenJDK (JDK 11), so this is not a change of the specification, just an update to make the use consistent in tests, comments, documentation etc.

I also removed the use of -XX:+FlightRecorder, which is not needed, and has been deprecated since JDK 13. 

Testing: jdk/jdk/jfr, tier 1-4.

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/3561/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3561&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265036
  Stats: 97 lines in 39 files changed: 0 ins; 0 del; 97 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3561.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3561/head:pull/3561

PR: https://git.openjdk.java.net/jdk/pull/3561