timer,domain: maintain order of timer callbacks

PR-URL: https://github.com/nodejs/node/pull/10522
Fixes: https://github.com/nodejs/node/issues/1271


Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>