Have importwallet use ImportPrivKeys and ImportScripts

Behavior changes:
* An "Importing ..." line is logged for every key, even ones that are skipped

src/wallet/rpcdump.cpp

@@ -656,18 +656,18 @@ UniValue importwallet(const JSONRPCRequest& request)
             CPubKey pubkey = key.GetPubKey();
             assert(key.VerifyPubKey(pubkey));
             CKeyID keyid = pubkey.GetID();
-            if (pwallet->HaveKey(keyid)) {
-                pwallet->WalletLogPrintf("Skipping import of %s (key already present)\n", EncodeDestination(PKHash(keyid)));
-                continue;
-            }
+
             pwallet->WalletLogPrintf("Importing %s...\n", EncodeDestination(PKHash(keyid)));
-            if (!pwallet->AddKeyPubKey(key, pubkey)) {
+
+            if (!pwallet->ImportPrivKeys({{keyid, key}}, time)) {
+                pwallet->WalletLogPrintf("Error importing key for %s\n", EncodeDestination(PKHash(keyid)));
                 fGood = false;
                 continue;
             }
-            pwallet->mapKeyMetadata[keyid].nCreateTime = time;
+
             if (has_label)
                 pwallet->SetAddressBook(PKHash(keyid), label, "receive");
+
             nTimeBegin = std::min(nTimeBegin, time);
             progress++;
         }
@@ -675,24 +675,19 @@ UniValue importwallet(const JSONRPCRequest& request)
             pwallet->chain().showProgress("", std::max(50, std::min(75, (int)((progress / total) * 100) + 50)), false);
             const CScript& script = script_pair.first;
             int64_t time = script_pair.second;
-            CScriptID id(script);
-            if (pwallet->HaveCScript(id)) {
-                pwallet->WalletLogPrintf("Skipping import of %s (script already present)\n", HexStr(script));
-                continue;
-            }
-            if(!pwallet->AddCScript(script)) {
+
+            if (!pwallet->ImportScripts({script}, time)) {
                 pwallet->WalletLogPrintf("Error importing script %s\n", HexStr(script));
                 fGood = false;
                 continue;
             }
             if (time > 0) {
-                pwallet->m_script_metadata[id].nCreateTime = time;
                 nTimeBegin = std::min(nTimeBegin, time);
             }
+
             progress++;
         }
         pwallet->chain().showProgress("", 100, false); // hide progress dialog in GUI
-        pwallet->UpdateTimeFirstKey(nTimeBegin);
     }
     pwallet->chain().showProgress("", 100, false); // hide progress dialog in GUI
     RescanWallet(*pwallet, reserver, nTimeBegin, false /* update */);