void setEquivalentHosts(Set<InetAddress> equivs) {
    Iterator<InetAddress> it = equivs.iterator();
    synchronized (equivalentHosts) {
      while (it.hasNext()) {
        equivalentHosts.put(it.next(), Collections.unmodifiableSet(equivs));
      }
    }
  }
Set the host equivalencies for a given host. This overrides any previous information in the
tables.

@param equivs list of InetAddress's that all point at same host
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java