hg: code-tools/jtreg: Add test for JDK.getJDKVersion (7902453)

[jonathan.gibbons at oracle.com]

Changeset: 82de1f4bf541
Author:    jjg
Date:      2019-05-10 11:22 -0700
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/82de1f4bf541

Add test for JDK.getJDKVersion (7902453)

+ test/jdkVersion/JDKVersionTest.gmk
+ test/jdkVersion/TEST.ROOT
+ test/jdkVersion/Test.java