Remove nsgroup link when destroying the container

src/lxc/destroy.c

@@ -67,6 +67,7 @@ int lxc_destroy(const char *name)
 	
 	snprintf(path, MAXPATHLEN, LXCPATH "/%s/init", name);
 	unlink(path);
+	lxc_unlink_nsgroup(name);
 
 	if (lxc_unconfigure(name)) {
 		lxc_log_error("failed to cleanup %s", name);