RFR: JDK-8268150: tier2: test/jdk/tools/jpackage/junit/junit.java needs updating for jtreg 6

[Jonathan Gibbons]

Please review a small test fix, to include hamcrest.jar, as required by the latest version of JUnit  in jtreg 6.

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Commit messages:
 - JDK-8268150: tier2: test/jdk/tools/jpackage/junit/junit.java needs updating for jtreg 6

Changes: https://git.openjdk.java.net/jdk/pull/4328/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4328&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268150
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4328.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4328/head:pull/4328

PR: https://git.openjdk.java.net/jdk/pull/4328