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

[mandy . chung]

Changeset: b0076c96fadc
Author:    mchung
Date:      2017-04-04 22:09 -0700
URL:       http://hg.openjdk.java.net/jigsaw/jake/hotspot/rev/b0076c96fadc

Update jtreg required version to 4.2 b07

! test/TEST.ROOT