RFR: 8259662: Don't wrap SocketExceptions into SSLExceptions in SSLSocketImpl [v7]

[Clive Verghese]

> Redo for 8237578: JDK-8214339 (SSLSocketImpl wraps SocketException) appears to not be fully fixed
> 
> This also fixes JDK-8259516: Alerts sent by peer may not be received correctly during TLS handshake

Clive Verghese has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2057/files
  - new: https://git.openjdk.java.net/jdk/pull/2057/files/72fef9b8..888162a4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2057&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2057&range=05-06

  Stats: 15 lines in 2 files changed: 0 ins; 9 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2057.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2057/head:pull/2057

PR: https://git.openjdk.java.net/jdk/pull/2057