static int minimum() {
    return 10;
  }
Returns an adjusted interval from <code>minimum()</code to
<code>intervalMillis</code> milliseconds. If jittering is disabled then the value returned will
be equal to intervalMillis.

@return adjust milliseconds to use as interval for WaitCriteria polling
geode-dunit/src/main/java/org/apache/geode/test/dunit/Jitter.java