RFR: JDK-8315214: Do not run sun/tools/jhsdb tests concurrently

[Chris Plummer]

On Tue, 29 Aug 2023 13:46:08 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The sun/tools/jhsdb tests have issues when we run them concurrently .
> So add a related config to TEST.root.

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15469#pullrequestreview-1601124989