fix debug statement.

src/exchange-lib/exchange_api_handle.c

@@ -833,7 +833,7 @@ keys_completed_cb (void *cls,
   struct TALER_EXCHANGE_Keys kd_old;
   enum TALER_EXCHANGE_VersionCompatibility vc;
 
-  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
               "Received keys from URL `%s' with status %ld.\n",
               kr->url,
               response_code);

src/exchange-lib/testing_api_cmd_check_keys.c

@@ -80,6 +80,8 @@ check_keys_run (void *cls,
     GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                 "Triggering /keys dl, cmd `%s'\n",
                 cmd->label);
+
+    /* Means re-download /keys.  */
     GNUNET_break (0 == TALER_EXCHANGE_check_keys_current
       (cks->exchange, GNUNET_YES).abs_value_us);
     return;