[jdk15u-dev] RFR: 8275082: Update XML Security for Java to 2.3.0

[Yuri Nesterenko]

I'd like to backport it here, too, to keep 15u on par with major releases.
Conflicts: in Init.java and Policy.java because of 8266459: Implement JEP 411, and in RFC2253Parser.java because of NumberFormatError handling small refactoring.

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Commit messages:
 - Backport 2c31a1735d5b8646ed8984a5475d5c8c9c91c19d

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/165/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=165&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275082
  Stats: 408 lines in 32 files changed: 59 ins; 267 del; 82 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/165.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/165/head:pull/165

PR: https://git.openjdk.java.net/jdk15u-dev/pull/165