Changing "varchar() binary" to varbinary in MySQL and Sqlite for two
columns: rd_title and rd_fragment.
Fixing db drifts of schema in Postgres:
- Setting the data type of rd_namespace from SMALLINT and setting its
default
- Set empty string as default of rd_title
- Changing datatype of rd_interwiki to varchar (PG supports that)
Bug: T164898
Bug: T230428
Change-Id: I9563792b1fc0ce5f3de78c08703a768a0c2e99d0
