RFR: 8274736: Concurrent read/close of SSLSockets causes SSLSessions to be invalidated unnecessarily [v4]

[Jamil Nimeh]

> This fix handles cases where two or more threads may be acting on a single SSLSocket instance.  In cases where one thread closes the socket while the other is in the middle of a read, a SocketException is appropriately thrown, but it results in SSLSession invalidation even though the session was legitimately negotiated at an earlier point in time and should remain in the cache.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8274736

Jamil Nimeh has updated the pull request incrementally with one additional commit since the last revision:

  Do not reinstantiate SSLContext, add more iterations, add test batch without using session tickets

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6197/files
  - new: https://git.openjdk.java.net/jdk/pull/6197/files/a68781f2..5ddd0535

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6197&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6197&range=02-03

  Stats: 20 lines in 1 file changed: 12 ins; 6 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6197/head:pull/6197

PR: https://git.openjdk.java.net/jdk/pull/6197