[jdk8u-dev] RFR: 8268916: Tests for AffirmTrust roots

[Severin Gehwolf]

Clean backport modulo context differences (after path suffeling). After this, `CAInterop.java` is the same as in openjdk/jdk11u. Patch as requested in #401 

Testing:
 - [ ] GHA (still running, includes new tests).

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Commit messages:
 - Backport 8c1bb2b28066ee32bef22110df06318d938c7d8b

Changes: https://git.openjdk.org/jdk8u-dev/pull/406/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=406&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8268916
  Stats: 54 lines in 1 file changed: 54 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/406.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/406/head:pull/406

PR: https://git.openjdk.org/jdk8u-dev/pull/406