OAK-1757: Oak eats too many CPU cycles when idle Make the Fast clock update interval configurable for testing purposes
Reduce default clock update frequency to 100Hz (again as this was lost by the previous merge)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1589716 13f79535-47bb-0310-9956-ffa450edef68