Remove / change some places that are long deprecated or no longer
needed:
- openstack-common.conf - was used for pulling code from oslo-incubator,
but that is dead for at least 8 months already.
- deploy.yaml playbook - declared as deprecated more than a year ago
- enroll.yaml playbook - declared as deprecated more than a year ago
- a task and var in bifrost-test-vm role - deprecated test
playbooks were removed recently, and their handling in this role is no
longer needed.
Change-Id: I2d694cf1974d6b95ed10764b8d2de8989b640e81
7579106992