@Override
    public String toString() {
        return "TimingValues [successTimeout=" + successTimeout
               + ", errorTimeout=" + errorTimeout
               + ", initialTimeout=" + initialTimeout
               + ", subscribeTimeout=" + subscribeTimeout
               + ", fixedDelay=" + fixedDelay
               + ", rand=" + rand + "]";
    }
Returns a number +/- a random component

@param value      input
@param fraction for instance 0.1 for +/- 10%
@return a number
config/src/main/java/com/yahoo/vespa/config/TimingValues.java