[jdk16u] RFR: 8259662: Don't wrap SocketExceptions into SSLExceptions in SSLSocketImpl

[Paul Hohensee]

Please review this backport to 16u. The backport is clean, except for syntax-only
changes to catch expressions, and one context change in SSLSocketImpl.java.

Original JBS: https://bugs.openjdk.java.net/browse/JDK-8259662
Original commit: https://github.com/openjdk/jdk/commit/63f8fc87

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Commit messages:
 - 8259662: Don't wrap SocketExceptions into SSLExceptions in SSLSocketImpl

Changes: https://git.openjdk.java.net/jdk16u/pull/93/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=93&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259662
  Stats: 204 lines in 7 files changed: 177 ins; 4 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/93.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/93/head:pull/93

PR: https://git.openjdk.java.net/jdk16u/pull/93