Besides classes in jdk.test.lib package, hotspot test-library contains
other common libraries:
  * jdk.test.lib.cli -- a test framework for command line option tests
  * jdk.test.lib.dcmd -- aux classes to simplify work w/ jcmd
  * jdk.test.lib.dtrace -- a test framework for dtrace tests

all these packages can be used in jdk tests as well. These packages should be moved to top-level repository.