@Override
  public int getPort() {
    return port;
  }
Method to create & send the ClientMembershipMessage to admin members. The message is sent
only if there are any admin members in the distribution system.

@param event describes a change in client membership
@param type type of event - one of ClientMembershipMessage.JOINED,
       ClientMembershipMessage.LEFT, ClientMembershipMessage.CRASHED
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractCacheServer.java