Review Request 30596: Updated the slave to set the graceful shutdown for the command executor.

[Ben Mahler]

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https://reviews.apache.org/r/30596/
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Review request for mesos, Alexander Rukletsov, Niklas Nielsen, and Vinod Kone.


Bugs: MESOS-2228
    https://issues.apache.org/jira/browse/MESOS-2228


Repository: mesos


Description
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This ensures the slave can see the TaskInfo.command.grace_period_seconds inside 
the ExecutorInfo, when setting up the shutdown timeout.


Diffs
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  src/slave/slave.cpp a8b262174ab5c9a524db8318d3d1438cd75a702b 

Diff: https://reviews.apache.org/r/30596/diff/


Testing
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make check


Thanks,

Ben Mahler