Ruby

parallel.rb: fix intervention

• test/lib/test/unit/parallel.rb (_report): send a response and a
  newline atomically, to get rid of intervention with "p" which
  runs in a separate thread.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57589 b2dd03c8-39d4-4d8f-98ff-823fe69b080e