This removes the systemd service templates and tasks from this role and
leverages a common systemd service role instead. This changet 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.
In addition, it re-orders some tasks for consistency with other roles.
Change-Id: I124873a6ab96aa95f886ce146d28e7340c90d40d
376ddeb48f