Added support for `tests.failfast` and `tests.maxiters`

This commit adds support for failing fast when running a test
case with `-Dtests.iters=N` and uses some goodness from LuceneTestCase
in a new base `AbstractRandomizedTest`. This class checks among other
things if a tests doesn't call `super.setup` / `super.tearDown` when it
should do and checks if a large static resources are not cleaned up
after the tests ie. a running node.