ST-1288 Make roles compliant with psi-mid

Two keys were added to the common role. ntp_apply when false ignores the 4 ntp tasks (default is true). change_hostnames when false skips the task to change the hostname (default is true). Also, the podman repo information was updated in the podman role. Since podman now does not require a /etc/containers.conf file that task is allowed to fail. Molecule tests for docker now use ubuntu 20.04 as base image.