Review Request: Added a general comment describing jsonurl.py and updated the error handling of recursive key lookup to avoid printing the Python "stack trace" when there is an exception (i.e., more becoming of a utility).

[Benjamin Hindman]

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https://reviews.apache.org/r/9376/
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Review request for mesos and Vinod Kone.


Description
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See summary.


Diffs
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  support/jsonurl.py 0d74b710fda507d64e899f76f55d3c698ae9886f 

Diff: https://reviews.apache.org/r/9376/diff/


Testing
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Thanks,

Benjamin Hindman