private static boolean hasNoReferences(final Pair<Boolean, Boolean> p) {
    return !p.getFirst() || !p.getSecond();
  }
@param p A pair where the first boolean says whether or not the daughter region directory
         exists in the filesystem and then the second boolean says whether the daughter has
         references to the parent.
@return True the passed <code>p</code> signifies no references.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/CatalogJanitor.java