Fix promoter server playbook
Fix promoter server playbook

Fix various issues for promter server playbook, add external
volume to server.

Change-Id: I35bbc1052eb070a469bb3ca21fa2a8ef349e0493

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