def all_options
      env_variable_options = UserOptions.new
      global_configuration_options = UserOptions.new(Departure.configuration.global_percona_args)
      options = env_variable_options.merge(global_configuration_options).merge(DEFAULT_OPTIONS)
      options.to_a.join(' ')
    end
def all_options
      env_variable_options = UserOptions.new
      global_configuration_options = UserOptions.new(Departure.configuration.global_percona_args)
      options = env_variable_options.merge(global_configuration_options).merge(DEFAULT_OPTIONS)
      options.to_a.join(' ')
    end
Returns all the arguments to execute pt-online-schema-change with

 @return [String]