Clean up database name validation in fabric2_db

`normalize_dbname/1` is not needed as database names do not have the `.couch`
suffix, and we don't have shard paths any more. For validation, send the
`DbName` to the `fabric2_db_plugin` as both the real DbName and the
"normalized" one. This is mostly to avoid changing the plugin interface for now
and should be eventually updated (in a separate PR).
1 file changed