RFR: 8296087: Problem list headful tests which may fail on Linux VMs

[Phil Race]

Problem list 2 tests which fail on Linux VMs.

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Commit messages:
 - 8296087
 - 8296087

Changes: https://git.openjdk.org/jdk/pull/10911/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10911&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296087
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10911.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10911/head:pull/10911

PR: https://git.openjdk.org/jdk/pull/10911