RFR: 8310978: JFR events SocketReadEvent/SocketWriteEvent for Socket adaptor ops

[Tim Prinzing]

Added jar event support to socket adapters.

Added the test jdk/jfr/event/io/TestSocketAdapterEvents.java

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Commit messages:
 - add missing return
 - socket adapter changes to build with merged master
 - Merge branch 'master' into JDK-8310978
 - fix copyright date
 - 8310978: JFR events SocektReadEvent and SocketWriteEvent for Socket adaptor ops

Changes: https://git.openjdk.org/jdk/pull/16251/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16251&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310978
  Stats: 168 lines in 2 files changed: 158 ins; 8 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16251.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16251/head:pull/16251

PR: https://git.openjdk.org/jdk/pull/16251