Show machine tokens for auto-placed units.

This fixes https://bugs.launchpad.net/juju-gui/+bug/1383381
Please refer to the bug for QA instructions.
Merge pull request #627 from frankban/auto-place-tokens

Show machine tokens for auto-placed units.

This fixes https://bugs.launchpad.net/juju-gui/+bug/1383381
Please refer to the bug for QA instructions.