Re-organize juno specs

As discussed on the latest sahara meeting, we've decided to re-organize
specs to have the following two categories:

 - approved: things we approved but didn't implement
 - implemented: things approved and implemented

Current change doing it for Juno specs, except Kilo and client.

Change-Id: Idcf55ca37a83d7098dcb7c2971240c4e8fd23dc8