Review Request 30597: Fixed the executor driver and command executor to read the graceful shutdown time.

[Ben Mahler]

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https://reviews.apache.org/r/30597/
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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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Now the executor and task graceful times are being read, note thought that they 
are still being over-written by the slave. See here: 
https://reviews.apache.org/r/30601/


Diffs
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  src/exec/exec.cpp aada24664dba9060a92230e25689c89852585443 
  src/launcher/executor.cpp 1cf28f168cac6e8c7e98686a35509c2b4e052504 

Diff: https://reviews.apache.org/r/30597/diff/


Testing
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make check


Thanks,

Ben Mahler