hg: jigsaw/jake/jaxp: Bump jtreg requiredVersion to 4.2

[mandy . chung]

Changeset: d5f6b0d71c34
Author:    mchung
Date:      2016-03-15 12:00 -0700
URL:       http://hg.openjdk.java.net/jigsaw/jake/jaxp/rev/d5f6b0d71c34

Bump jtreg requiredVersion to 4.2

! test/TEST.ROOT