RFR: 8321557: Move SOURCE line verification of OracleJDK out of OpenJDK

Thu Dec 7 23:34:23 UTC 2023

The main goal of this patch is to remove the OracleJDK specific verification of the SOURCE field in the release file from the OpenJDK test. While at it, I decided to do some cleanup as well to make the code a bit more modern and less unnecessarily verbose.

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Commit messages:
 - Rename method
 - JDK-8321557

Changes: https://git.openjdk.org/jdk/pull/17027/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17027&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321557
  Stats: 70 lines in 1 file changed: 8 ins; 39 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/17027.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17027/head:pull/17027

PR: https://git.openjdk.org/jdk/pull/17027