RFR: 8367326: Refactor PEM API tests requiring PEMRecord usage

[Mikhail Yankelevich]

Changed to use PEM API: 
* test/jdk/sun/security/validator/PKIXValAndRevCheckTests.java
* test/jdk/sun/security/rsa/pss/PSSKeyCompatibility.java
* test/jdk/sun/security/pkcs11/rsa/TestKeyFactory.java

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Commit messages:
 - JDK-836732: Refactor PEM API tests requiring PEMRecord usage

Changes: https://git.openjdk.org/jdk/pull/28356/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28356&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367326
  Stats: 134 lines in 3 files changed: 52 ins; 23 del; 59 mod
  Patch: https://git.openjdk.org/jdk/pull/28356.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28356/head:pull/28356

PR: https://git.openjdk.org/jdk/pull/28356