RFR: 8290398: jpackage exe instellers are not installed in jtreg tests

[Alexey Semenyuk]

8290398: jpackage exe instellers are not installed in jtreg tests

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Commit messages:
 - 8290398: jpackage exe instellers are not installed in jtreg tests

Changes: https://git.openjdk.org/jdk/pull/9530/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9530&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290398
  Stats: 56 lines in 1 file changed: 35 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/9530.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9530/head:pull/9530

PR: https://git.openjdk.org/jdk/pull/9530