RFR: JDK-8247592: refactor test/jdk/tools/launcher/Test7029048.java

[Aleksei Voitylov]

Hi,

I'd like to refactor test/jdk/tools/launcher/Test7029048.java, make the
logic easier to follow and remove some magic numbers from the test:

JBS: https://bugs.openjdk.java.net/browse/JDK-8247592
Webrev: http://cr.openjdk.java.net/~avoitylov/webrev.8247592.01/

Testing: the test passes on Linux x86, Linux x86_64, Linux ARM, Linux
AArch64, Linux PPC, Windows x86, Windows x86_64, Mac, AIX. Special
thanks to SAP team for helping test on AIX.

Thanks,
-Aleksei