Fix compute_bulk
What's new:
- Query "/reviews?scheme=geo&limit=250&issuers=true&maresi_subjects=true", fixing the issue spawning too much task with DbConn; Best solution for Fn 'compute_bulk' is to perform sequentially querying data cause limit is unknown (can be 5, 10 or 150, ...); The only one limitation is lambda running time (~15sec).