Review Request 57730: Fixed example tests which broke due to the new `register_agents` ACL.

[Jiang Yan Xu]

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Review request for mesos and Anindya Sinha.


Bugs: MESOS-7097
    https://issues.apache.org/jira/browse/MESOS-7097


Repository: mesos


Description
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- With the new `register_agents` ACL, `permissive == false` would lead
  to the agent unable to register unless explicitly allowed.


Diffs
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  src/tests/script.cpp 3b68b845b06fe19acb8b08e1ff3dd0bec9117f05 


Diff: https://reviews.apache.org/r/57730/diff/1/


Testing
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make check


Thanks,

Jiang Yan Xu