RFR(S) : 8180887: move FileUtils to top level testlibrary

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8180887/webrev.00/index.html
> 567 lines changed: 231 ins; 252 del; 84 mod;

Hi all,

could you please review this changeset which moves FileUtils class from the jdk testlibrary to the top level testlibary?

webrev: http://cr.openjdk.java.net/~iignatyev/8180887/webrev.00/index.html
jbs: https://bugs.openjdk.java.net/browse/JDK-8180887
testing: :tier[1-3]

Thanks,
-- Igor