[jdk8u-dev] RFR: 8346140: tools/jar/ExtractFilesTest.java and tools/jar/MultipleManifestTest.java fails with jtreg5.1

[Alexey Bakhtin]

…stTest.java fails with jtreg5.1

Tests fixed to be compatible with jtreg 5.1

-------------

Commit messages:
 - 8346140: tools/jar/ExtractFilesTest.java and tools/jar/MultipleManifestTest.java fails with jtreg5.1

Changes: https://git.openjdk.org/jdk8u-dev/pull/612/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=612&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346140
  Stats: 42 lines in 2 files changed: 1 ins; 18 del; 23 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/612.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/612/head:pull/612

PR: https://git.openjdk.org/jdk8u-dev/pull/612