RFR: 8245311: [macos] misc package tests failed due to "execution error: Finder got an error: AppleEvent timed out."

[alexander.matveev at oracle.com]

Please review the jpackage fix for bug [1] at [2].

- "hdiutil detach" resource busy error is fixed in same way as 
JDK-8242786 by repeating detach several times.
- pkgbuild timeout will be covered with JDK-8249395.

[1] https://bugs.openjdk.java.net/browse/JDK-8245311
[2] http://cr.openjdk.java.net/~almatvee/8245311/webrev.00/

Thanks,
Alexander