@Override
  @VisibleForTesting
  public int getPrimaryPort() {
    int result = -1;
    ServerLocation sl = getPrimary();
    if (sl != null) {
      result = sl.getPort();
    }
    return result;
  }
Test hook that returns a string consisting of the host name and port of the primary server.
Null is returned if we have no primary.
geode-core/src/main/java/org/apache/geode/cache/client/internal/PoolImpl.java