[Merge] lp:~jonas-drange/ubuntu-ui-extras/consolidated-devices into lp:ubuntu-ui-extras/staging

[Andrew Hayzen]

Changes look good, and there is a test :-)

Only thing is if you want todo what we discussed about having a way of adding printers that are "unknown". So that you can pick the name/uri and it fills the fields it knows but lets the user pick the driver etc.
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https://code.launchpad.net/~jonas-drange/ubuntu-ui-extras/consolidated-devices/+merge/321497
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