RFR(XXS) : 8181715 : sun/net/www/protocol/jar/jarbug/TestDriver.java fails after 8181335

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8181715/webrev.00/index.html
> 2 lines changed: 1 ins; 0 del; 1 mod;

Hi all,

could you please review this tiny fix for sun/net/www/protocol/jar/jarbug/TestDriver.java?
the test had two problems: 
1. it uses CompilerUtils from default package which has been removed by 8181335[1]
2. it has a typo in @build: jdk.test.lib.CompilerUtils instead of jdk.test.lib.compiler.CompilerUtils

jbs: https://bugs.openjdk.java.net/browse/JDK-8181715
webrev: http://cr.openjdk.java.net/~iignatyev//8181715/webrev.00/index.html
testing: affected test

[1] https://bugs.openjdk.java.net/browse/JDK-8181335

Thanks,
-- Igor