RFR: 8235482: [TESTBUG] PackageType LINUX_RPM should be excluded for jpackage tests on debian systems

[Jie Fu]

Hi all,

May I get reviews for the small fix?

JBS:    https://bugs.openjdk.java.net/browse/JDK-8235482
Webrev: http://cr.openjdk.java.net/~jiefu/8235482/webrev.00/

Thanks a lot.
Best regards,
Jie