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 
int64_t _nTime, unsigned int _entryHeight,
                                 bool _spendsCoinbase, int64_t _sigOpsCost, LockPoints lp)
    : tx(_tx), nFee(_nFee), nTxWeight(GetTransactionWeight(*tx)), nUsageSize(RecursiveDynamicUsage(tx)), nTime(_nTime), entryHeight(_entryHeight),
    spendsCoinbase(_spendsCoinbase), sigOpCost(_sigOpsCost), lockPoints(lp)
{
    nCountWithDescendants = 1;
    nSizeWithDescendants = GetTxSize();
    nModFeesWithDescendants = nFee;
    feeDelta = 0;
    nCountWithAncestors = 1;
    nSizeWithAncestors = GetTxSize();
    nModFeesWithAncestors = nFee;
    nSigOpCostWithAncestors = sigOpCost;
}
void CTxMemPoolEntry::UpdateFeeDelta(int64_t newFeeDelta)
{
    nModFeesWithDescendants += newFeeDelta - feeDelta;
    nModFeesWithAncestors += newFeeDelta - feeDelta;
    feeDelta = newFeeDelta;
}
void CTxMemPoolEntry::UpdateLockPoints(const LockPoints& lp)