FIX Multiple callbacks on XML error
ADD Validation against the Keystone Proxy
FIX Some linter errors
ADD Test unauthenticated keystone proxy access
FIX Remove .only from tests
ADD Some logs to the authentication middleware
ADD Debug log for the Keystone Proxy Authentication response
Merge pull request #20 from telefonicaid/feature/IOTCORE-112_Integration

Feature/iotcore 112 integration