def start
      RequireSpy.spy_require(transport)
      error = try_require(require_string)
      return transport.done_and_wait_for_ack unless error

      transport.exit_with_error(error)
      exit(1)
    end
def start
      RequireSpy.spy_require(transport)
      error = try_require(require_string)
      return transport.done_and_wait_for_ack unless error

      transport.exit_with_error(error)
      exit(1)
    end
Prints the process pid, so it can be grabbed by the supervisor process, inits tranport fifos
 and requires requested libraries.
 Installs the require-spying code and starts requiring