[jdk11u-dev] RFR: 8281599: test/lib/jdk/test/lib/KnownOIDs.java is redundant since JDK-8268801

[Martin Doerr]

Cleanup after https://github.com/openjdk/jdk11u/commit/256c17f85328f5548b84b67b609afad9b89f026a.
Test copy was introduced with backport of JDK-8153005: https://github.com/openjdk/jdk11u-dev/commit/596cc70c9724b31ffee454b7a21ecefec731c4ba

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Commit messages:
 - 8281599: test/lib/jdk/test/lib/KnownOIDs.java is redundant since JDK-8268801

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/818/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=818&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281599
  Stats: 522 lines in 5 files changed: 3 ins; 516 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/818.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/818/head:pull/818

PR: https://git.openjdk.java.net/jdk11u-dev/pull/818