Comment 9 for bug 1339730

There may be a bug related with 'timer_delete', which is called by system when there is an alive timer after gearmand is killed.
In this patch file, these timers will be deleted when object of gearman_server_options_st is destructed.
This patch file also fixes the bug in
        https://bugs.launchpad.net/gearmand/+bug/1390672