RFR: 8237578: JDK-8214339 (SSLSocketImpl wraps SocketException) appears to not be fully fixed [v6]

[Clive Verghese]

> This PR aims to revert some more cases where SocketExceptions are improperly being wrapped as SSLException. Some work for this was done in [JDK-8235263](https://bugs.openjdk.java.net/browse/JDK-8235263), but that change did not cover all the cases.
> 
> As it was mentioned in JDK-8235263, some applications rely on receiving SocketException to decide if the connection should be retried. An example of this would be Apache HTTP client. This PR should ideally fix https://issues.apache.org/jira/browse/HTTPCLIENT-2032

Clive Verghese has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Address Review comments on transport shutdow and using SSLSocketTemplate

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1968/files
  - new: https://git.openjdk.java.net/jdk/pull/1968/files/6d2f6433..98f15872

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1968&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1968&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1968.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1968/head:pull/1968

PR: https://git.openjdk.java.net/jdk/pull/1968