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test_io_console.rb: separate master and slave

• test/io/console/test_io_console.rb (test_getpass): separate
  master side and slave side in each threads. r52937 deadlocked
  on OS X. [Bug #11780] [ruby-dev:49412]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52939 b2dd03c8-39d4-4d8f-98ff-823fe69b080e