RFR: 8348986: Improve coverage of enhanced exception messages [v2]

[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 incrementally with one additional commit since the last revision:

  doc + copyright update

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23929/files
  - new: https://git.openjdk.org/jdk/pull/23929/files/c4419860..074da251

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23929&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23929&range=00-01

  Stats: 23 lines in 3 files changed: 10 ins; 5 del; 8 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