UpdateContextAvailabilitySubscriptionRequest json render OK
found a few more errors about ++restrictions
More fixes for 'restrictions' where it shouldn't be
Lots of changes in render to support a correct json output - also, started to move expected part to external files
Removed some unwanted LM_Ms
Merge pull request #149 from telefonicaid/bug/json_render_UpdateContextAvailabilitySubscriptionRequest

Step 1 towards a correct JSON payload rendering