8170860: Get rid of the humanReadableByteCount() method in openjdk/hotspot
Reviewed-by: mgerdin, mchernov

8165687: Fix license and copyright headers in jd9 under hotspot/test
Summary: Legal notices and Oracle copyrights were updated (white and blank space, commas) in tests files for uniformity to meet Oracle requirements.
Reviewed-by: dholmes, iris
Contributed-by: Stanislav Smirnov <stanislav.smirnov@oracle.com>, Vassili Igouchkine <vassili.igouchkine@oracle.com>

8157468: gc/testlibrary contains a lot of duplicated code
Reviewed-by: dfazunen, iignatyev

8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff

8153764: Add auxiliary method that generates class by class prototype to gc testlibrary
Reviewed-by: dfazunen, iignatyev

8143933: Create testlibrary for auxiliary methods used in g1/humongousObjects testing
Reviewed-by: iignatyev, dfazunen