[jdk11u-dev] RFR: 8259801: Enable XML Signature secure validation mode by default [v2]

[Goetz Lindenmaier]

> I backport this for parity with 11.0.23-oracle.
> 
> I resolved the Copyright in the test, will mark clean.
> 
> I have to check for the backport CSR.
> 
> Update: CSR available now: https://bugs.openjdk.org/browse/JDK-8323287

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into goetz_backport_8259801
 - Backport baf46bac41f11c01691c4d4c77b24f76fedb5926

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2426/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2426/files/f903b230..b629bc45

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2426&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2426&range=00-01

  Stats: 800 lines in 31 files changed: 426 ins; 27 del; 347 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2426.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2426/head:pull/2426

PR: https://git.openjdk.org/jdk11u-dev/pull/2426