RFR: 8349532: Refactor ./util/Pem/encoding.sh to run in java [v2]

[Mikhail Yankelevich]

> * ./util/Pem/encoding.sh is now a java test
> * also added the validations for the test results, not only an error check

Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:

  changes to improve readability and removal of unneded System.out.print

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23492/files
  - new: https://git.openjdk.org/jdk/pull/23492/files/2f524826..88c4b729

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23492&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23492&range=00-01

  Stats: 32 lines in 1 file changed: 6 ins; 21 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/23492.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23492/head:pull/23492

PR: https://git.openjdk.org/jdk/pull/23492