public Builder createRootDir(boolean createRootDir) {
      this.createRootDir = createRootDir;
      return this;
    }
Builder pattern for creating an {@link StartTestingClusterOption}.
<p/>
The default values of its fields should be considered public and constant. Changing the default
values may cause other tests fail.
hbase-server/src/test/java/org/apache/hadoop/hbase/StartTestingClusterOption.java