This removes the systemd service templates and tasks from this role and
leverages a common systemd service role instead. This change removes a
lot of code duplication across all roles all without sacrificing
features or functionality. The intention of this change is to ensure
uniformity and reduce the maintenance burden on the community when
sweeping changes are needed. The exterior role is built to be OSA
compatible and may be pulled into tree should we deem it necessary.
Change-Id: I404639ae7ebd349d4a11fc5ce1ef3d2805833217
2f73f21e65