Ruby

Revert r29986: "Imported minitest 2.0.0 r5952"

This breaks test-all:

• two test-all errors (test_run_passing and test_run_failing_filtered).
• -v option to test-all is ignored

Additional to say, please describe summary of the change when you
import from external repository.

And, RUN test-all BEFORE COMMIT.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29988 b2dd03c8-39d4-4d8f-98ff-823fe69b080e