Review Request 41858: [WIP][MESOS-3892] kill executors helper

[Klaus Ma]

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Review request for mesos and Guangya Liu.


Bugs: MESOS-3892
    https://issues.apache.org/jira/browse/MESOS-3892


Repository: mesos


Description
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kill executors helper


Diffs
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  src/slave/slave.hpp b7586ce42bfac9d9885a3eb8d82deb94680c236c 
  src/slave/slave.cpp 9d80c96d8e28085c7fa47ce21b9b055c0926d12c 

Diff: https://reviews.apache.org/r/41858/diff/


Testing
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Thanks,

Klaus Ma