[migration] Stop asking confirm to commit

[migration] Fix crash on 3.24 migration Some sql using a column droped the line above crash migration of cw < 3.24.

[devtools] Skip computed relations when attempting to auto-populate test database Fix the automatic database population underlying automatic test to avoid attempt to create computed relations.

[test] Use our BaseTestCase in unittest_rtags.py We need it DeprecatedInstanceWithoutModule for assertWarns method. Use this instead of unittest2 directly with a try/except block to get rid of flake8 error about import not being one top of file.