[Merge] ~seb128/software-properties:ubuntu-pro-visible-on-lts into software-properties:ubuntu/master

[Robert Ancell]

Review: Approve

The only negative side-effect of this change is it will disable the UI for Livepatch, which is currently shown in non-LTS releases. I doubt that's an issue, as I don't think Livepatch works on non-LTS anyway? And I guess now Livepatch is considered part of Ubuntu Pro and not a separate thing. The command line is still available.
-- 
https://code.launchpad.net/~seb128/software-properties/+git/software-properties/+merge/431128
Your team Ubuntu Core Development Team is subscribed to branch software-properties:ubuntu/master.