[jdk11u-dev] RFR: 8242313: use reproducible random in hotspot svc tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

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Commit messages:
 - Backport 116fe806c3008680cfb21484f6469a5ccb638c5d

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/931/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=931&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242313
  Stats: 16 lines in 3 files changed: 10 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/931.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/931/head:pull/931

PR: https://git.openjdk.java.net/jdk11u-dev/pull/931