[migration] Test and fix case of addition of an attribute with some serialized constraint It was crashing on attempt to remove an unexisting constraint. This code may be removed safely as it's expected to be handled by the constraint removal hook. Notice that adding a vocabulary on shortpara makes yams change the varchar max size. This is arguable but not the point of this test, so simply adapt the max size defined in the schema coherently so we don't have to bother with that at this point. Grafted from f87da59faea1 in default branch.

[skeleton] Properly format debian/changelog using current datetime and author information Reformat "context" dict to have it PEP8 compliant along the way (only white space changes).

[utils] Encode Binary value in base64 for JSON export In unittest_utils.py, use unittest2's TestCase instead of lgc.testlib one to benefit from subTest API. Closes #15409885.