qemu: conf: Set default logging approach in virQEMUDriverConfigNew

Instead of setting the default qemu stdio logging approach in
virQEMUDriverConfigLoadFile set it in virQEMUDriverConfigNew so that
it's properly set even when the config is not present.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1325075
(cherry picked from commit 63e2b766a5)

src/qemu/qemu_conf.c

@@ -324,6 +324,7 @@ virQEMUDriverConfigPtr virQEMUDriverConfigNew(bool privileged)
     cfg->seccompSandbox = -1;
 
     cfg->logTimestamp = true;
+    cfg->stdioLogD = true;
 
 #ifdef DEFAULT_LOADER_NVRAM
     if (virQEMUDriverConfigLoaderNVRAMParse(cfg, DEFAULT_LOADER_NVRAM) < 0)
@@ -812,8 +813,6 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
             goto cleanup;
         }
         VIR_FREE(stdioHandler);
-    } else {
-        cfg->stdioLogD = true;
     }
 
     GET_VALUE_ULONG("max_queued", cfg->maxQueuedJobs);