RFR(S) : 8180898: remove JavaToolUtils testlibrary class

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8180898/webrev.00/index.html
> 209 lines changed: 0 ins; 209 del; 0 mod; 0

Hi all,

8180895[1] has updated the sole user of JavaToolUtils class to use other testlibrary classes, JavaToolUtils itself does not provide any unique methods, so it should be removed.

webrev: http://cr.openjdk.java.net/~iignatyev//8180898/webrev.00/index.html
jbs: https://bugs.openjdk.java.net/browse/JDK-8180898
testing: grep -rl JavaToolUtils ./jdk/test

[1] https://bugs.openjdk.java.net/browse/JDK-8180898

Thanks,
-- Igor