The value of the object tmnxCronSchedCount specifies
the number of times to trigger a schedule with schedType
equal to 'periodic'. The schedule disables itself by changing
into the `finished' schedOperStatus once the schedule has
triggered tmnxCronSchedCount number of times.
When tmnxCronSchedCount has the value zero (0),
there is no limit to the number of times the schedule will
trigger.
Note that implementations which maintain a list of pending
activations must re-calculate them when this object is
changed.