Review Request 21086: Use explicit exists for executable to test for post-review

[Dominic Hamon]

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https://reviews.apache.org/r/21086/
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Review request for mesos and Vinod Kone.


Bugs: MESOS-931
    https://issues.apache.org/jira/browse/MESOS-931


Repository: mesos-git


Description
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see summary


Diffs
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  support/post-reviews.py c0066bde94a826695b9f4d5a71a8e0893213504e 

Diff: https://reviews.apache.org/r/21086/diff/


Testing
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uploaded this patch!


Thanks,

Dominic Hamon