Update vehicle signal using app recipes

Update vehicle signal using app recipes

Update the recipes for the Qt demo applications that were previously
using signal-composer either directly or indirectly to work with the
new VehicleSignals API in libqtappfw.  For most of them this means
installing the new configuration file and associated JSON web token
file for KUKSA.val authorization.  At present all the apps are using
one of the default read-write tokens from the KUKSA.val install, but
ideally this will end up migrated to app specific tokens with
appropriate permissions JSON down the road, potentially obtained
via OAuth or similar mechanism.

Additionally, the tbtnavi recipe has been updated to install a
systemd unit to start it at boot.

Bug-AGL: SPEC-4409, SPEC-4426

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia87b9f16b8db0eb43863da3e9656d9d1f094fe20