Drop the unused scenario file
Drop the unused scenario file

The scenario-py3.pp file was added to test python3 support but python3
is already globally used and the file is useless.

Change-Id: I8ebd21ff275bf16be02fa9a9d3442bda7bc8c09e

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration