Revert "Minimize the classpath pants passes to java for running tests."

This reverts commit aa4a419785e1d45e778292ddc67df90420f60185.

This change breaks code that tries to re-formulate classpaths.
A notable example is here:
  https://github.com/twitter/util/blob/master/util-eval/src/main/scala/com/twitter/util/Eval.scala#L317

We'll attack this from a different angle.

https://rbcommons.com/s/twitter/r/269/