They seem to think ping is too dangerous for normal users.

Co-Authored-By: Pierre Riteau <pierre@stackhpc.com>
Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/824903
Change-Id: I30c2a7b6850350901b15fe196175508634c8e9a5

This makes it cleaner, allows reuse and outsourcing to zuul jobs
and enables us to create multiple of these overlay networks for
testing of more advanced scenarios.

Change-Id: Id557c81f68a7f34556854e7d6efc6eddfd2e7216