Change default tox molecule env
Change default tox molecule env

Remove molecule_delegated env and run all scenarios
by default, delegated and non-delegated ones.

Change-Id: I07c973915cc66d477a1b97a840e4594f82117f9f

redhat-openstack/rdo-infra,rdo-infra/ci-config,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config