Update Dockerfile and playbook for newer operator-sdk and ansible

[jmontleon]

It looks like we're supposed to be installing this now from a requirements.yml.

As an example: https://github.com/operator-framework/operator-sdk/blob/master/testdata/ansible/memcached-operator/Dockerfile https://github.com/operator-framework/operator-sdk/blob/master/testdata/ansible/memcached-operator/requirements.yml

k8s_facts are also good and gone now so we need to replace them with k8s_info.