Review Request: Added a check in master to reject tasks with neither a CommandInfo nor an ExecutorInfo present.

[Vinod Kone]

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https://reviews.apache.org/r/9367/
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Review request for mesos, Benjamin Hindman, Florian Leibert, and Ben Mahler.


Description
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See summary.


This addresses bug MESOS-187.
    https://issues.apache.org/jira/browse/MESOS-187


Diffs
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  src/master/master.cpp 20384f9f10ec37f03d61b1952424631a3bde9725 

Diff: https://reviews.apache.org/r/9367/diff/


Testing
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make check


Thanks,

Vinod Kone