RFR: 8310996: Add JFR event for connect operations

[Tim Prinzing]

Adds a JFR event for socket connect operations.

Existing tests TestSocketEvents and TestSocketChannelEvents modified to also check for connect events.

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Commit messages:
 - fix default settings
 - fix merge
 - Merge branch 'master' into JDK-8310996
 - added tests and support for sockets.
 - 8310996: Add JFR event for connect operations

Changes: https://git.openjdk.org/jdk/pull/21528/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21528&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310996
  Stats: 247 lines in 12 files changed: 236 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/21528.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21528/head:pull/21528

PR: https://git.openjdk.org/jdk/pull/21528