x/ref: Restructure services/device

The renamings:

cmd/mgmt                     -> services/device
cmd/mgmt/device              -> services/device/device

services/mgmt/device         -> services/device
services/mgmt/device/deviced -> services/device/deviced
services/mgmt/device/config  -> services/device/internal/config
services/mgmt/device/impl    -> services/device/internal/impl
services/mgmt/device/starter -> services/device/internal/starter

MultiPart: 1/2
Change-Id: I3e27d49b09744d06c0957c7c8b1315a0063c7b82
73 files changed