v2.10.2

1. Minor bug fixes
2. Adjusted rate limit
3. Added support to centralized database connection pool
   • Use single connection pool for all hubs running under a single service
   • Enable this feature by toggling on the option --use-master-db-pool
   • --master-db-host, --master-db-user, --master-db-password, --master-db-pool-size must be provided as well
4. Added dlog_meta table for GET /dlog/list to reduce database delay