fix(units): restore v0.12.0 units for old deisctl client

The v0.12.0 `deisctl` client can be installed from these links:
- https://s3-us-west-2.amazonaws.com/opdemand/deisctl-0.12.0-linux-amd64.run
- https://s3-us-west-2.amazonaws.com/opdemand/deisctl-0.12.0-darwin-amd64.run

Users explicitly trying to install the v0.12.0 `deisctl` client are then getting slightly updated unit files, including the removal of *deis-builder-data* and the `EXPOSED_PORT` change, which are incompatible with deis release v0.12.0. This change restores the v0.12.0 unit files to this old repository, which the v0.12.0 `deisctl` is referencing.