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

[alan . bateman]

Changeset: 3b8630b84906
Author:    alanb
Date:      2016-04-29 08:34 +0100
URL:       http://hg.openjdk.java.net/jigsaw/jake/langtools/rev/3b8630b84906

Move jtreg required version to 4.2 b02

! test/TEST.ROOT