- Changed replica_parallel_workers in configuration for 8.0 and 8.4 to o, because wiat_for_replicas is buggy for multi-threaded slaves (cherry picked from commit d9b0219d9e)
- Minor tests diagnostic and cleanup
- Updated sandbox data file
- Fixes for pt-upgrade since there is no query_cache in MySQL 8
- Updates for SchemaIterator since there are new/renamed tables in MySQL 8
- Disabled some tests due to errors in MySQL 8.0.4-rc