Review Request 36493: Added a stub Event message handler in the scheduler driver.

[Ben Mahler]

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Review request for mesos and Vinod Kone.


Bugs: MESOS-2910
    https://issues.apache.org/jira/browse/MESOS-2910


Repository: mesos


Description
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See MESOS-2910.


Diffs
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  src/sched/sched.cpp e372a15db035f74d525561839b873ed659e2c33f 

Diff: https://reviews.apache.org/r/36493/diff/


Testing
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Each event is tested in the follow up patches.


Thanks,

Ben Mahler