hg: jdk9/sandbox/jdk: 8129822: Define "headful" jtreg keyword

[chris.hegarty at oracle.com]

Changeset: 65f38133842d
Author:    darcy
Date:      2015-06-25 08:30 -0700
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/65f38133842d

8129822: Define "headful" jtreg keyword
Reviewed-by: alanb, alexsch

! test/TEST.ROOT