Comment 6 for bug 1801364

I'm attaching a test case that shows the failure on python2.7.
The issue is in the way that we're serializing binary data into
json. The implementation we have (using default=json_serialize_default)
just does not work in python2.7.

I recall that I had seen a stackexchange question basically covering
this and the dsubmitter eventually just throwing up their hands.

This adds the test case to show the problem, but does not do anything to fix it.