hg: jdk/jdk: 8219158: use 'test.root' property instead of traversing test-src path

[igor.ignatyev at oracle.com]

Changeset: 68bbd727dd5f
Author:    iignatyev
Date:      2019-02-22 11:07 -0800
URL:       http://hg.openjdk.java.net/jdk/jdk/rev/68bbd727dd5f

8219158: use 'test.root' property instead of traversing test-src path
Reviewed-by: dholmes

! test/hotspot/jtreg/vmTestbase/gc/g1/unloading/GenClassesBuilder.java
! test/hotspot/jtreg/vmTestbase/nsk/monitoring/stress/classload/GenClassesBuilder.java
! test/hotspot/jtreg/vmTestbase/vm/mlvm/share/StratumClassesBuilder.java
! test/hotspot/jtreg/vmTestbase/vm/runtime/defmeth/shared/BuildJar.java
! test/lib/jdk/test/lib/Utils.java