--no-retry. [Feature #4415] [ruby-dev:43226],[ruby-dev:43222],[ruby-core:35294] * lib/test/unit/parallel.rb: Used at test/unit --jobs(-j) option. * test/csv/test_serialization.rb: test/unit parallel running ready. * test/rake/test_file_task.rb: test/unit parallel running ready. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30939 b2dd03c8-39d4-4d8f-98ff-823fe69b080e