Review Request: Call driver.stop() with an argument in python example framework

[Charles Reiss]

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https://reviews.apache.org/r/2815/
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Review request for mesos.


Summary
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Fixes MESOS-78.


This addresses bug MESOS-78.
    https://issues.apache.org/jira/browse/MESOS-78


Diffs
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  src/examples/python/test_framework.py 0e4b14c 

Diff: https://reviews.apache.org/r/2815/diff


Testing
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Checked output of tests/external/SampleFrameworks/PythonFramework.sh


Thanks,

Charles