Abort RS when the hostname is different from master seen

if (
  !StringUtils.isBlank(useThisHostnameInstead)
    && !hostnameFromMasterPOV.equals(useThisHostnameInstead)
) {
  String msg = "Master passed us a different hostname to use; was="
    + this.useThisHostnameInstead + ", but now=" + hostnameFromMasterPOV;
  LOG.error(msg);
  throw new IOException(msg);
}
if (
  StringUtils.isBlank(useThisHostnameInstead)
    && !hostnameFromMasterPOV.equals(rpcServices.getSocketAddress().getHostName())
) {
  String msg = "Master passed us a different hostname to use; was="
    + rpcServices.getSocketAddress().getHostName() + ", but now=" + hostnameFromMasterPOV;
  LOG.error(msg);
}