Dean Troyer ef1a86a802 Fix image selection in server function tests
The image selection has been affected by Cirros image changes in DevStack,
make the logic moe robust and convert it to JSON.  The conversion for the
remainder of the file will follow.

Change-Id: I8f3318f55ed79d617c3594142f0c086e2bd1a7b1
2017-02-17 12:14:41 -06:00
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