In Python 3, the generated JSON patches have a different representation than
those generated with Python 2. For instance, the patch generated in
test_patch_should_replace_missing_core_properties() is:
'[{"op": "replace", "value": "red", "path": "/color"}]'
in Python 2, but:
'[{"path": "/color", "value": "red", "op": "replace"}]'
in Python 3. Therefore, the comparison fails, and the test fail. We fix the
tests by comparing JsonPatch objects rather than strings.
Closes-Bug: #1281374
Change-Id: Id435e87664b2d2aa0ba69f2df1c1fad431651963
3cced6085d