logging: Don't inhibit shutdown in system daemon

That is a job of libvirtd and virtlogd has a dependency on it, so that will
prevent it properly.  Doing it one extra time in virtlogd might also cause AVC
denials because it is not allowed to call that dbus method.

Caused by commit df34363d.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1547250Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/logging/log_daemon.c

@@ -128,6 +128,12 @@ virLogDaemonInhibitor(bool inhibit, void *opaque)
 {
     virLogDaemonPtr dmn = opaque;
 
+    /* virtlogd uses inhibition only to stop session daemon being killed after
+     * the specified timeout, for the system daemon this is taken care of by
+     * libvirtd and the dependencies between the services. */
+    if (virNetDaemonIsPrivileged(dmn->dmn))
+        return;
+
     if (inhibit)
         virNetDaemonAddShutdownInhibition(dmn->dmn);
     else