[hotfix] update scripts.py invalid invocation

[richardliaw]

Why are these changes needed?

==> /tmp/ray/session_2020-08-30_01-47-33_393277_81299/logs/monitor.out <==
Traceback (most recent call last):
  File "/home/ubuntu/anaconda3/bin/ray", line 8, in <module>
    sys.exit(main())
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/ray/scripts/scripts.py", line 1600, in main
    return cli()
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/ray/scripts/scripts.py", line 465, in start
    address, redis_address)
TypeError: validate_redis_address() takes 1 positional argument but 2 were given

Related issue number

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/latest/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failure rates at https://ray-travis-tracker.herokuapp.com/.
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested (please justify below)