hg: jdk10/sandbox: 8180887: move FileUtils to top level testlibrary

[chris.hegarty at oracle.com]

Changeset: abbba823f850
Author:    iignatyev
Date:      2017-05-30 14:56 -0700
URL:       http://hg.openjdk.java.net/jdk10/sandbox/rev/abbba823f850

8180887: move FileUtils to top level testlibrary
Reviewed-by: psandoz

+ test/lib/jdk/test/lib/util/FileUtils.java