class RuboCop::RSpec::ParallelFormatter

def output_rerun_commands(summary)

removed!
output goes where in the final parallelized output, and should not be
The BEGIN/END comments are used by `spec_runner.rake` to determine what 
def output_rerun_commands(summary)
  output.puts '# RERUN BEGIN'
  output.puts summary.colorized_rerun_commands.lines[3..].join
  output.puts '# RERUN END'
end