autoplacing machines doesn't trigger db changed event

[Jeff Pihach]

To reproduce:

Place a console.log in on_database_changed and dbChangedHandler in app.js
Drag a service to the canvas and switch to the machine view
Click the autoplace, you'll notice that there are no logs from the db change event being called.
Click to deploy and you'll see the db update event logs

This event not being called causes issue with databound fields throughout the rest of the application