Bug 1097959 - Add THROTTLER_CHECK_PERIOD to detune Throttler

* Add THROTTLER_CHECK_PERIOD element to /etc/sysconfig/watchman to
  allow Operator to set period for checking cgroup counters
Merge pull request #5421 from jwhonce/stage

Merged by openshift-bot
Automatic commit of package [openshift-origin-node-util] release [1.23.4-1].