hg: jigsaw/jake/nashorn: Move jtreg required version to 4.2 b02

[alan . bateman]

Changeset: 5a7ca4c37313
Author:    alanb
Date:      2016-04-29 08:36 +0100
URL:       http://hg.openjdk.java.net/jigsaw/jake/nashorn/rev/5a7ca4c37313

Move jtreg required version to 4.2 b02

! test/TEST.ROOT