Select the first machine and bare metal container by default.
Merge pull request #424 from huwshimi/default-selected-machine

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