[jdk8u] RFR: 8314960: Add Certigna Root CA - 2

[Severin Gehwolf]

Backport of JDK-8314960 to add new certigna root 2 certificate to OpenJDK 8u392 as a critical fix during rampdown. Patch applies cleanly after path shuffling and backporting [JDK-8295894](https://bugs.openjdk.org/browse/JDK-8295894). See #48 

Testing:
- [ ] GHA (still running)
- [x] `jdk/test/security/infra/java/security/cert/CertPathValidator` and  `jdk/test/sun/security/lib/cacerts` jtreg tests. All pass except `AmazonCA.java` which is a different matter (it'll be OK again once JDK-8309088 is in as well).

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Depends on: https://git.openjdk.org/jdk8u/pull/48

Commit messages:
 - Backport a44f8b059847135ecd0618cb04abbb0d2be1d2d0

Changes: https://git.openjdk.org/jdk8u/pull/49/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u&pr=49&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314960
  Stats: 568 lines in 4 files changed: 338 ins; 227 del; 3 mod
  Patch: https://git.openjdk.org/jdk8u/pull/49.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u.git pull/49/head:pull/49

PR: https://git.openjdk.org/jdk8u/pull/49