Adjust virtlogd sysconfig file to conform to SUSE standards

Index: libvirt-4.7.0/src/logging/virtlogd.sysconf
===================================================================
--- libvirt-4.7.0.orig/src/logging/virtlogd.sysconf
+++ libvirt-4.7.0/src/logging/virtlogd.sysconf
@@ -1,3 +1,7 @@
+## Path: System/Virtualization/virtlogd
+
+## Type: string
+## Default: ""
 #
 # Pass extra arguments to virtlogd
 #VIRTLOGD_ARGS=