[migration] make sure the repo knows about all constraint types
Adding new constraint types is cumbersome. It's easy to forget to do it
in a migration script. So sync the constraint types at the beginning of
each migration.
Closes #3724892
\.svn
^build$
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\.pyc$
\.pyo$
\.bak$
\.old$
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\.swp$
^doc/book/en/apidoc$
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syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/