Utilization idle checker option to whether normalize resource utilization

CPU utilization is not normalized (its capacity is always 1000, but usage can exceed 1000) but cuda utilization is normalized (its capacity is calculated by the number of cuda devices allocated to a kernel and usage cannot exceed the capacity)Let's give an option to idle checker to normalize resource utilization or not.

Currently webui shows GPU stat of kernels by `live_stat.current` instead of `live_stat.pct` and that causes inconsistency between resource stat and utilization idleness report.

JIRA Issue: BA-85