Do not override an existed thread in the testing framework #511
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A thread for storing debuggee's output is defined https://github.com/ruby/debug/blob/master/test/support/utils.rb#L333 as a
reader_thread
in remote_info. However, it's overridden in https://github.com/ruby/debug/pull/511/files#diff-a1bc4fb86b4a4e8cc3d94199a4d2b9152c2c8da2261be54d0529942f64a8105dL155. This PR fixes it.