daemon: remove deprecated AuFS storage driver

There's still some locations refering to AuFS;

- pkg/archive: I suspect most of that code is because the whiteout-files
  are modelled after aufs (but possibly some code is only relevant to
  images created with AuFS as storage driver; to be looked into).
- contrib/apparmor/template: likely some rules can be removed
- contrib/dockerize-disk.sh: very old contribution, and unlikely used
  by anyone, but perhaps could be updated if we want to (or just removed).

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/check-config.sh

@@ -368,14 +368,6 @@ EXITCODE=0
 STORAGE=1
 
 echo '- Storage Drivers:'
-echo "  - \"$(wrap_color 'aufs' blue)\":"
-check_flags AUFS_FS | sed 's/^/    /'
-if ! is_set AUFS_FS && grep -q aufs /proc/filesystems; then
-	echo "      $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"
-fi
-[ "$EXITCODE" = 0 ] && STORAGE=0
-EXITCODE=0
-
 echo "  - \"$(wrap_color 'btrfs' blue)\":"
 check_flags BTRFS_FS | sed 's/^/    /'
 check_flags BTRFS_FS_POSIX_ACL | sed 's/^/    /'