RFR: 8346048: test/lib/containers/docker/DockerRunOptions.java uses addJavaOpts() from ctor

[Leonid Mesnik]

Trivial fix to avoid using methods from DockerRunOptions().

Don't methods final, just  for using them in ctor.

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Commit messages:
 - 8346048: test/lib/containers/docker/DockerRunOptions.java uses addJavaOpts() from ctor

Changes: https://git.openjdk.org/jdk/pull/22748/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22748&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346048
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22748.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22748/head:pull/22748

PR: https://git.openjdk.org/jdk/pull/22748