RFR: JDK-8163991: Fix license and copyright headers under test/jdk/javadoc/ and test/tools/javac/

[Sandeep Konchady]

Hello,

Please review the patch below which fixes copyright in test files for javadoc 
and javac

Bug: https://bugs.openjdk.java.net/browse/JDK-8163991
Webrev: http://cr.openjdk.java.net/~shurailine/8163991/webrev.00/langtools.patch

Thanks,
Sandeep