Create File for OMS population

In the topology management, during link discovery, call OLM to calculate the span-loss,and fill OMS attribute in the topology. Because we calculate now OSNR, we need to fill in the topology span-loss current and base (at first time). Need to define the procedure on how to update the OMS attribute in the topology first. In a second step, identify if specific code needs to be develop to handle it in a scalable way.
_Complement input topology file used for test with OMS information
_For environment created from simulated node (some of the functional tests) create the JSON file including OMS attribute corresponding to simulated node and add in the test script the command to load OMS attributes through North API.