dialect.mysql.connection-manager: handleDisconnects
add `.destroy` proxy method into CM
Merge pull request #2450 from findhit/feature/connection-manager-handle-disconnects

dialect.mysql.connection-manager: handleDisconnects
Add reference to Instance to public API
Merge pull request #2473 from overlookmotel/instance-made-public

Add reference to Instance to public API
Merge remote-tracking branch 'upstream/master'