Select the first machine and bare metal container by default.

This branch selects the first machine by default when the machine view panel is opened. Additionally, when you select a machine the bare metal container is now selected by default.

QA:
- drag two charms to the canvas
- click deploy and confirm
- open the machine view panel
- the first machine should be selected and the bare metal container should be selected
- click on the unselected machine
- the containers for the second machine should be shown with the bare metal container selected
While unlikely, the order of records in an object is not guaranteed. Is there a more resilient way of fetching this information? Like from the machine model list ex) `modelList.item(0)`