Show number of failed pulls in print-stats

    dprintf(out, "********Pulled Atom stats***********\n");

    for (const auto& pair : mPulledAtomStats) {

        dprintf(out,

                "Atom %d->(total pull)%ld, (pull from cache)%ld, (min pull interval)%ld \n"

                "Atom %d->(total pull)%ld, (pull from cache)%ld, "

                "(pull failed)%ld, (min pull interval)%ld \n"

                "  (average pull time nanos)%lld, (max pull time nanos)%lld, (average pull delay "

                "nanos)%lld, "

                "  (max pull delay nanos)%lld, (data error)%ld\n"

                "  (pull timeout)%ld, (pull exceed max delay)%ld\n"

                "  (registered count) %ld, (unregistered count) %ld\n",

                (int)pair.first, (long)pair.second.totalPull, (long)pair.second.totalPullFromCache,

                (long)pair.second.minPullIntervalSec, (long long)pair.second.avgPullTimeNs,

                (long long)pair.second.maxPullTimeNs, (long long)pair.second.avgPullDelayNs,

                (long long)pair.second.maxPullDelayNs, pair.second.dataError,

                pair.second.pullTimeout, pair.second.pullExceedMaxDelay,

                (long)pair.second.pullFailed, (long)pair.second.minPullIntervalSec,

                (long long)pair.second.avgPullTimeNs, (long long)pair.second.maxPullTimeNs,

                (long long)pair.second.avgPullDelayNs, (long long)pair.second.maxPullDelayNs,

                pair.second.dataError, pair.second.pullTimeout, pair.second.pullExceedMaxDelay,

                pair.second.registeredCount, pair.second.unregisteredCount);

    }