plymouth/kernel: cleanup not needed parts for shutdown

remove plymouth and kernel parts from /run/initramfs, which are not
needed at shutdown.

https://bugzilla.redhat.com/show_bug.cgi?id=751189

modules.d/50plymouth/module-setup.sh

@@ -46,6 +46,7 @@ install() {
 
     inst_hook pre-pivot 90 "$moddir"/plymouth-newroot.sh
     inst_hook pre-trigger 10 "$moddir"/plymouth-pretrigger.sh
+    inst_hook pre-pivot 10 "$moddir"/plymouth-cleanup.sh
     inst_hook emergency 50 "$moddir"/plymouth-emergency.sh
     inst readlink
 }

modules.d/50plymouth/plymouth-cleanup.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+rm -fr /usr/share/plymouth /usr/lib/plymouth /usr/lib64/plymouth

modules.d/90kernel-modules/kernel-cleanup.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+rm -fr /lib/modules

modules.d/90kernel-modules/module-setup.sh

@@ -75,6 +75,7 @@ install() {
         inst_simple "$i"
     done
     inst_hook cmdline 01 "$moddir/parse-kernel.sh"
+    inst_hook pre-pivot 20 "$moddir/kernel-cleanup.sh"
     inst_simple "$moddir/insmodpost.sh" /sbin/insmodpost.sh
 
     for _f in modules.builtin.bin modules.builtin; do