8371769: TestMemoryInvisibleParent.java fails java.nio.file.AccessDeniedException

[sendaoYan]

Hi all,

Test test/hotspot/jtreg/containers/docker/TestMemoryInvisibleParent.java fails when run with non-root user. Test will try to write file /sys/fs/cgroup/memory/hidden-parent-TestMemoryInvisibleParent26/memory.limit_in_bytes, and this will make non-root user report java.nio.file.AccessDeniedException. So I think we should skip this test when user is not root.

This PR also add prefix indent for a try block, but do not touch the original logic.

Change has been verified locally on linux-aarch64 with non-root user.

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• JDK-8371769: TestMemoryInvisibleParent.java fails java.nio.file.AccessDeniedException (Bug - P4)

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