Test only change. With [JDK-8253435](https://bugs.openjdk.java.net/browse/JDK-8253435) a test has been added on the hotspot side, but nothing for the Java Metrics code. Same for [JDK-8252359](https://bugs.openjdk.java.net/browse/JDK-8252359). This patch alleviates that.
Thoughts? ------------- Commit messages: - 8253939: [TESTBUG] Increase coverage of the cgroups detection code for Java Changes: https://git.openjdk.java.net/jdk/pull/609/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=609&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8253939 Stats: 40 lines in 1 file changed: 27 ins; 0 del; 13 mod Patch: https://git.openjdk.java.net/jdk/pull/609.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/609/head:pull/609 PR: https://git.openjdk.java.net/jdk/pull/609
