RFR: 8348986: Improve coverage of enhanced exception messages [v6]

[Michael McMahon]

> Hi,
> 
> Enhanced exception messages are designed to hide sensitive information such as hostnames, IP 
> addresses from exception message strings, unless the enhanced mode for the specific category 
> has been explicitly enabled. Enhanced exceptions were first introduced in 8204233 in JDK 11 and 
> updated in 8207846.
> 
> This PR aims to increase the coverage of enhanced exception messages in the networking code.
> A limited number of exceptions are already hidden (restricted) by default. The new categories and 
> exceptions in this PR will be restricted on an opt-in basis, ie. the default mode will be enhanced
> (while preserving the existing behavior).
> 
> The mechanism is controlled by the security/system property "jdk.includeInExceptions" which takes as value
> a comma separated list of category names, which identify groups of exceptions where the exception
> message may be enhanced. Any category not listed is "restricted" which means that potentially
> sensitive information (such as hostnames, IP addresses, user identities) are excluded from the message text.
> 
> The changes to the java.security conf file describe the exact changes in terms of the categories now
> supported and any changes in behavior.
> 
> Thanks,
> Michael

Michael McMahon has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:

 - review update
 - Merge branch 'master' into 8348986-exceptions
 - update to minimise code changes
 - Merge branch 'master' into 8348986-exceptions
 - Merge branch 'master' into 8348986-exceptions
 - Apply suggestions from code review
   
   from turbanoff review
   
   Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
 - doc + copyright update
 - remove file added by mistake
 - whitespace
 - moved test
 - ... and 10 more: https://git.openjdk.org/jdk/compare/b7837843...da33863c

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Changes: https://git.openjdk.org/jdk/pull/23929/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23929&range=05
  Stats: 948 lines in 42 files changed: 715 ins; 101 del; 132 mod
  Patch: https://git.openjdk.org/jdk/pull/23929.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23929/head:pull/23929

PR: https://git.openjdk.org/jdk/pull/23929