Device Registration Improvements

[SBriere]

Describe the solution you'd like
Currently, the device register API is open, only limited to the number of requests made per second. To improve features and security:

• A server key should be generated and required on each device register request
• Device type key should be used instead of id_device_type. If non-existing, a new one should be created
• Device sub type name should be used if required
• Device registration events should be properly logged by the Logging service.