gw: Add Meshblu registration response consistency
gw: Add Meshblu registration response consistency

This patch extends the registration response parsing function returning
the status of JSON parsing (UUID & token).

CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source