[jdk17u-dev] RFR: 8271892: mark hotspot runtime/PrintStringTableStats/PrintStringTableStatsTest.java test as ignoring external VM flags

[Goetz Lindenmaier]

I backport this for 17.0.10-oracle parity.

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Commit messages:
 - Backport 9654fd73cd72e12cdb6934727f251dddacc18654

Changes: https://git.openjdk.org/jdk17u-dev/pull/1770/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1770&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271892
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1770.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1770/head:pull/1770

PR: https://git.openjdk.org/jdk17u-dev/pull/1770