private String shortName(String hostname) {
    if (hostname == null) {
      return "<null inet_addr hostname>";
    }
    int index = hostname.indexOf('.');

    if (index > 0 && !Character.isDigit(hostname.charAt(0))) {
      return hostname.substring(0, index);
    } else {
      return hostname;
    }
  }
An InternalDistributedMember created for a test or via readEssentialData will be a Partial ID,
possibly not having ancillary info like "name".

@return true if this is a partial ID
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/MemberIdentifierImpl.java