Remove obsolete examples

At this time, many demo examples are available
to demonstrate use of AGL framework.

Keeping these obsoletes examples introduces confusion.
Maintaining these examples is possible but not done
from what I see.

In conclusion, removing it is much cleaner.

Change-Id: I29a68eabf48a72d4a681de9b641da72f647ffbac
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/12017
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>