pilatus 100k acquisition cannot be stopped when running at a high frame rate in exttrigmult

When running at a high frame rate and with extntrigger mode the camserver K command (kill acquisition) is ignore and the acquisition cannot be stopped. This is due to the expperiod camserver parameter set by Lima always to the latency_time, minimum is the detector readoutime 950us. Setting a period when using external trigger modes is useless and to fix this issue we just need to set the period to a value greater to 100ms. This issue does not append with the bigger detector models.