[CI] `linux://python/ray/tune:test_commands` is failing/flaky on master.

[justinvyu]

• ddfeae3c86b997e7a0bf1391f37d2831a2da3542 FAILED Buildkite :octopus: Tune tests and examples (small)
• 073e7bc04d989607848552537f9f5ac91fa07d85 FAILED Buildkite :octopus: Tune tests and examples (small)
• df76ac7975334a5fec7affcc910076ca435fb772 FAILED Buildkite :octopus: Tune tests and examples (small)
• 161de0b74a660ab6af3e889c1f465059e7fc6334 FAILED Buildkite :octopus: Tune tests and examples (small)

Recently started failing from https://github.com/ray-project/ray/commit/073e7bc04d989607848552537f9f5ac91fa07d85

>       assert sum(times) / len(times) < 6.0, "CLI is taking too long!"
--
  | E       AssertionError: CLI is taking too long!
  | E       assert (32.00284552574158 / 5) < 6.0
  | E        +  where 32.00284552574158 = sum([6.6674323081970215, 6.387358903884888, 6.3391945362091064, 6.313596248626709, 6.2952635288238525])
  | E        +  and   5 = len([6.6674323081970215, 6.387358903884888, 6.3391945362091064, 6.313596248626709, 6.2952635288238525])
  |  
  | python/ray/tune/tests/test_commands.py:61: AssertionError

.... Generated from flaky test tracker. Please do not edit the signature in this section. DataCaseName-linux://python/ray/tune:test_commands-END ....

[xwjiang2010]

still happening now. will try to take a look this sprint.

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