manager.py should be able to rewrite queries to show desired repo

[RogerTangos]

Currently, a user posting to /api/v1/query/{repo_base}/{repo_name}/ must also specify the repo_name in their query string. For example,

select * from repo_name.table rather than select * from repo.table

This is a limitation row level security. The trouble is that the RLS SQL parser has no way of knowing what schemas your query will be executed on unless it's specified with a period.

To fix this, we'd probably need to put a query parser and rewriter into the datahub manager.

It is useful to developers though, since it keeps their code portable.