Run jpackage jtreg tests on Windows sequentially. Asynch execution of `msiexec.exe` that unpacks msi files doesn't work well.
------------- Commit messages: - 8314909: tools/jpackage/windows/Win8282351Test.java fails with java.lang.AssertionError: Expected [0]. Actual [1618]: Changes: https://git.openjdk.org/jdk/pull/15766/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15766&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8314909 Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/15766.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15766/head:pull/15766 PR: https://git.openjdk.org/jdk/pull/15766