Device foreign key in the Message Model

Extend the message model with the a device foreignkey field.
Also include this field in the admin
Includes Migrations
Adapt the message helper for the new device field

Adapt the save_message function that it saved the device
Adapt the test
Cleanup and optimize import

Better imports
Optimize the logger that we dont get a to much needless infos
Uncomment old code
Hope it fix the bbug on live
Merge branch 'manual-parsing-of-message' into develop