Make db_pool close connections after time-out as documented, and fix get-after-close race condition that occurs when using TpooledConnectionPool.
Make db_pool close connections after time-out as documented,
and fix get-after-close race condition that occurs when
using TpooledConnectionPool.

tempbottle/eventlet,lindenlab/eventlet,collinstocks/eventlet,lindenlab/eventlet,collinstocks/eventlet,tempbottle/eventlet,lindenlab/eventlet