revert r1120,r1121 and do not pre-generate the apparmor cache during live-build

debian/changelog

@@ -1,11 +1,3 @@
-livecd-rootfs (2.307) UNRELEASED; urgency=low
-
-  * live-build/ubuntu-core/hooks/90_pecompile-apparmor.chroot:
-    - generate /etc/apparmod.d/cache files during image build to
-      avoid out-of-sync issue with profiles and cache (LP: #1460152)
-
- -- Michael Vogt <michael.vogt@ubuntu.com>  Mon, 01 Jun 2015 12:53:22 +0200
-
 livecd-rootfs (2.306) wily; urgency=medium
 
   * Create hooks and image build config for the ubuntu-desktop-next

live-build/ubuntu-core/hooks/90_precompile-apparmor.chroot

@@ -1,11 +0,0 @@
-#!/bin/sh
-#
-# similar to
-#   live-build/ubuntu-touch/hooks/90-precompile-apparmor-policies.chroot 
-# but we only care about the system apparmor (see LP: #1460152)
-
-set -e
-
-echo "I: precompiling deb apparmor policies"
-/sbin/apparmor_parser -Q --write-cache --cache-loc=/etc/apparmor.d/cache/ $(find /etc/apparmor.d/ -maxdepth 1 -type f -not -path '*/\.*')
-