[jdk11u-dev] RFR: 8208704: runtime/appcds/MultiReleaseJars.java timed out often in hs-tier7 testing

[Amos Shi]

Backport of [JDK-8208704](https://bugs.openjdk.org/browse/JDK-8208704)

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Commit messages:
 - Backport 6f046a9f2754f7f99d213c1e00952a9ea14aa3c2

Changes: https://git.openjdk.org/jdk11u-dev/pull/2304/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2304&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8208704
  Stats: 9 lines in 1 file changed: 0 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2304.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2304/head:pull/2304

PR: https://git.openjdk.org/jdk11u-dev/pull/2304