Migration step 148 will cause errors because we missed some
references to the columns being dropped. Removing the step
altogether causes problems with backwards compatibility tests
because the change already exists in the latest release tag.
To circumvent, we change v148 to an empty migration.
Add methods FindTable and RemoveColumn in private/dbutil/dbschema
Change-Id: Ia527e95b88a88c5dc82800928ce6f8cfb879e334
Pregenerate the database schema we should use for most tests.
Currently, Cockroach is slow with regards to migration and it's
better if it happens in as few transactions as possible.
This reduces test time from ~21min to ~15min.
Change-Id: Ife8117053e6b9ecf3c93fe63677edf15d4d7c254
