use fprintf / stdout for final benchmark result

src/benchmark/exchange_benchmark_home/.config/taler/account-2.json

@@ -1,5 +1,5 @@
 {
   "url": "payto://x-taler-bank/localhost:8082/2",
-  "salt": "N4KW3895XVGNTF2P135TAAYRY3Q452TP2RMAYVHPQ1ARD17T0KJ9XJH4CKY560S6D549C7VDNPSNA25FY6A9D6QYPTE4V85VE6SRSG8",
-  "master_sig": "GDVZM7ZNFS4KBWK37KZA1HA66KA374QZDZKANTCXH5G8JS2F4X73ZGXNMHX2FNXP93AZS1SCPVMVAVVBT7F4SQ8AH6SP5SCBZDRFW10"
+  "salt": "V7S6Y75HPSFGKXET03NHS3SDEST5Q0XNX9WYCXRRRNRHPBVSD86Y1A7ZR5KR7105JN3XDBTKWDD3WQZ9XA2MJKD020APECA0P61FFBG",
+  "master_sig": "H61WAQKG8F9W25SZNVF1JPNYG0BFYXPN65D936TT44ZC0JT849R8YNC0CFPJBQX77EW51DCR0864DC82A4J2AF7H55DSVVMWVYEZR1R"
 }

src/benchmark/taler-exchange-benchmark.c

@@ -645,13 +645,13 @@ main (int argc,
   GNUNET_free (exchange_url);
   duration = GNUNET_TIME_absolute_get_duration (start_time);
 
-  TALER_LOG_INFO ("Executed W=%u, D=%u, R=%u, operations in %s\n",
-                  howmany_coins,
-                  howmany_coins,
-                  howmany_refreshes,
-                  GNUNET_STRINGS_relative_time_to_string
-                    (duration,
-                     GNUNET_NO));
-
+  fprintf (stdout,
+           "Executed W=%u, D=%u, R=%u, operations in %s\n",
+           howmany_coins,
+           howmany_coins,
+           howmany_refreshes,
+           GNUNET_STRINGS_relative_time_to_string
+           (duration,
+            GNUNET_NO));
   return (GNUNET_OK == result) ? 0 : result;
 }