The rte_timer_alt_manage function should track which is the running
timer and whether or not it was updated by a callback in the priv_timer
structure that corresponds to the running lcore, so that restarting
or stopping the timer from the callback works correctly.
Fixes: c0749f7096c7 ("timer: allow management in shared memory")
Signed-off-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>