Create interface for urfkill

[Jonas G. Drange]

Use case:
System Settings uses this urfkill dbus api to toggle flight mode.

What happens:
Can't find an interface in snapd/interfaces/builtin/

What should happen:
An interface should exist, giving System Settings access to the flight mode toggle.

(Should not be limited to flight mode, though, unity8/indicator-network/etc will probably have other needs).

[Oliver Grawert (ogra)]

i would suggest these bits should be added to the network-control interface

[Simon Fels (morphis)]

@Oliver: We can't add everything required for urfkilld into the network-control interface as we also need to allow it owning a dbus system service. So in summary I think we can easily archive this with an urfkill + network-control interface.

[Jim Hodapp (jhodapp)]

@Simon: +1 to that, sounds like the right way to go forward.

[Jamie Strandboge (jdstrand)]

This was filed to support Ubuntu System Settings in Unity8. Per conversations with Bill and outcomes from the sprint, closing this bug as "Won't Fix" for now since the unity8 interface will take a different direction. Required interfaces for unity8 and supporting snaps will be filed at a later date once the plan is finalized.