Reported here: https://github.com/bitcoin/bitcoin/pull/10244#issuecomment-378035305

Travis log here: https://travis-ci.org/bitcoin/bitcoin/jobs/361243719#L2810

Note the JSON exception:

```
test_framework.authproxy.JSONRPCException: The mempool was not loaded yet (-1) 
```

That exception was introduced here: https://github.com/bitcoin/bitcoin/commit/cb1e319fe9e198c9c5cf5236fe9af5a3d748b9e8#diff-a0c8f511d90e83aa9b5857e819ced344R1617

cc @jtimon 
CSubNet subnet;
        LookupSubNet(net.c_str(), subnet);
        if (!subnet.IsValid())
            return InitError(strprintf(_("Invalid netmask specified in -whitelist: '%s'"), net));
        connOptions.vWhitelistedRange.push_back(subnet);
    }
    connOptions.vSeedNodes = gArgs.GetArgs("-seednode");
    
    connOptions.m_use_addrman_outgoing = !gArgs.IsArgSet("-connect");
    if (!connOptions.m_use_addrman_outgoing) {
        const auto connect = gArgs.GetArgs("-connect");
        if (connect.size() != 1 || connect[0] != "0") {
            connOptions.m_specified_outgoing = connect;
        }
    }
    if (!g_connman->Start(scheduler, connOptions)) {
        return false;
    }
    
    SetRPCWarmupFinished();
    uiInterface.InitMessage(_("Done loading"));
    for (const auto& client : interfaces.chain_clients) {
        client->start(scheduler);
    }
    scheduler.scheduleEvery([]{
        g_banman->DumpBanlist();
    }, DUMP_BANS_INTERVAL * 1000);
    return true;
}