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.
}
        }
        entry.push_back(Pair("scriptPubKey", HexStr(scriptPubKey.begin(), scriptPubKey.end())));
        entry.push_back(Pair("amount", ValueFromAmount(out.tx->tx->vout[out.i].nValue)));
        entry.push_back(Pair("confirmations", out.nDepth));
        entry.push_back(Pair("spendable", out.fSpendable));
        entry.push_back(Pair("solvable", out.fSolvable));
        results.push_back(entry);
    }
    return results;
}
UniValue fundrawtransaction(const JSONRPCRequest& request)
{
    if (!EnsureWalletIsAvailable(request.fHelp))
        return NullUniValue;
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw runtime_error(
                            "fundrawtransaction \"hexstring\" ( options )\n"
                            "\nAdd inputs to a transaction until it has enough in value to meet its out value.\n"
                            "This will not modify existing inputs, and will add at most one change output to the outputs.\n"
                            "No existing outputs will be modified unless \"subtractFeeFromOutputs\" is specified.\n"
                            "Note that inputs which were signed may need to be resigned after completion since in/outputs have been added.\n"
                            "The inputs added will not be signed, use signrawtransaction for that.\n"
                            "Note that all existing inputs must have their previous output transaction be in the wallet.\n"
                            "Note that all inputs selected must be of standard form and P2SH scripts must be\n"
                            "in the wallet using importaddress or addmultisigaddress (to calculate fees).\n"
                            "You can see whether this is the case by checking the \"solvable\" field in the listunspent output.\n"
                            "Only pay-to-pubkey, multisig, and P2SH versions thereof are currently supported for watch-only\n"
                            "\nArguments:\n"
                            "1. \"hexstring\"           (string, required) The hex string of the raw transaction\n"