hg: jigsaw/jake/jdk: Update jtreg required version to 4.2 b07

[mandy . chung]

Changeset: 3f059be20ccb
Author:    mchung
Date:      2017-04-04 22:09 -0700
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/3f059be20ccb

Update jtreg required version to 4.2 b07

! test/TEST.ROOT