If one calls `fundrawtransaction`, the change address will be retrieved from the keypool, though, this key/address will always be returned to the pool, leading to the problem that the next `getnewaddress()` call will restult in the same key/address.

Either we remove the auto-change-address (users would need to call `getrawchangeaddress` first [current best practice anyway]) or we add a call to keep/mark a specific key/address as change (after one have sent the funded raw transaction).

Reported by @NicolasDorier on IRC.
{
        CWalletTx& wtx = *(item.second);
        LOCK(mempool.cs);
        CValidationState state;
        wtx.AcceptToMemoryPool(maxTxFee, state);
    }
}
bool CWalletTx::RelayWalletTransaction(CConnman* connman)
{
    assert(pwallet->GetBroadcastTransactions());
    if (!IsCoinBase() && !isAbandoned() && GetDepthInMainChain() == 0)
    {
        CValidationState state;
        
        if (InMempool() || AcceptToMemoryPool(maxTxFee, state)) {
            LogPrintf("Relaying wtx %s\n", GetHash().ToString());
            if (connman) {
                CInv inv(MSG_TX, GetHash());
                connman->ForEachNode([&inv](CNode* pnode)
                {
                    pnode->PushInventory(inv);
                });
                return true;
            }
        }
    }
    return false;
}
set<uint256> CWalletTx::GetConflicts() const