Add in-progress commit status change indicator

When deploying a changeset there is a time between when the ecs sends the command and juju ack's it. This time can be quite large on large deployments and on slow environments. This now changes the blue circle in the machine view to a yellow one until the juju ack.
These are part of tests unrelated to this branch which just happened to fail because of changes I made here. The default setup for this suite populates a the machines model list so this resets it back to empty.