Fix rolling back columns with indices for SQLite and SQL Server #2128
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Instead of adding a new test for just this one problem, I've updated the existing reversible migrations test (it includes the problematic case of adding a column with an index to an existing table) and made it cross DBMS compatible, to add some more coverage in the process.
AFAICT, previously only MySQL was used except in one test for Postgres. Going forward, adding more cross DBMS coverage probably wouldn't hurt, so that finding DBMS specific issues becomes a bit easier.
refs #2126