slinux: Disable bell on created rootfs

So it will be disabled by default in live and vm/* images.
This make installer-feature-bell-off unneeded on SL-live.
See https://bugzilla.altlinux.org/show_bug.cgi?id=33653.

features.in/slinux/rootfs/image-scripts.d/60-no-bell

@@ -0,0 +1,17 @@
+#!/bin/sh -efu
+
+cat >>"/etc/inputrc" <<EOF
+# do not bell on tab-completion
+set bell-style none
+EOF
+
+if [ -d /etc/X11/xinit.d ]; then
+	cat >/etc/X11/xinit.d/disable-bell <<EOF
+#!/bin/sh
+# Generated by script during image creation
+# Disable bell.
+xset -b
+EOF
+
+chmod +x "/etc/X11/xinit.d/disable-bell" ||:
+fi