code: void handleCallbacksForFailedHosts(final Set<Integer> failedHosts) {
          for (ProcedureRunnerNT runner : m_outstanding.values()) {
              runner.processAnyCallbacksFromFailedHosts(failedHosts);
          }
      }
docs: For all-host NT procs, use site failures to call callbacks for hosts
  that will obviously never respond.
  
  ICH and the other plumbing should handle regular, txn procs.