[jdk13u-dev] RFR: 8274736: Concurrent read/close of SSLSockets causes SSLSessions to be invalidated unnecessarily

[Yuri Nesterenko]

I'd like to port it for parity with major releases. The patch applies cleanly but like in 11u (and unlike 15u), there's a necessary addition to the test at  line 270.

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Commit messages:
 - Backport 8822d41fdcc2c2d568badd72635dc587d21dbd63

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/324/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=324&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274736
  Stats: 431 lines in 3 files changed: 427 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/324.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/324/head:pull/324

PR: https://git.openjdk.java.net/jdk13u-dev/pull/324