RFR: 8037: Cleanups in configuration.test and graphview.test

[Christoph Langer]

A few cleanups for test projects

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Commit messages:
 - JMC-8037

Changes: https://git.openjdk.org/jmc/pull/466/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=466&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8037
  Stats: 26 lines in 5 files changed: 16 ins; 8 del; 2 mod
  Patch: https://git.openjdk.org/jmc/pull/466.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/466/head:pull/466

PR: https://git.openjdk.org/jmc/pull/466