In the log I see things like:

    2017-09-13 03:54:33 init message: Rescanning...
    2017-09-13 03:54:33 Rescanning last 68616 blocks (from block 416339)...
    2017-09-13 03:54:40 AddToWallet xxxxx  update
    2017-09-13 03:55:33 Still rescanning. At block 418849. Progress=0.549138

I would be interested to see the wallet file name on each of these log lines.

Would there be any interest in merging such a PR?
#include <chain.h>
#include <key_io.h>
#include <rpc/server.h>
#include <validation.h>
#include <script/script.h>
#include <script/standard.h>
#include <sync.h>
#include <util.h>
#include <utiltime.h>
#include <wallet/wallet.h>
#include <merkleblock.h>
#include <core_io.h>
#include <wallet/rpcwallet.h>
#include <fstream>
#include <stdint.h>
#include <boost/algorithm/string.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <univalue.h>
int64_t static DecodeDumpTime(const std::string &str) {