RFR: 8250803: pkgbuild failed with exit code 134

[alexander.matveev at oracle.com]

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

- Looks like issue was just in not enough time for test to execute. 
Increasing timeout by 1 min fixed issues. In fix it is increased by 50% 
just in case. Without timeout increase it was reproducible 100% on one 
of test machine. With increased timeout I cannot reproduce it after 
multiple runs.

[1] https://bugs.openjdk.java.net/browse/JDK-8250803
[2] http://cr.openjdk.java.net/~almatvee/8250803/webrev.00/

Thanks,
Alexander