create json files for GNPy functional tests

create json files for GNPy functional tests

- put topology descriptions in json files
  (instead of directly in the script)
- those json files describe the clli, openroadm and openroadm network
  topologies, that are needed to generate the GNPy topology.
- These sample configs contain two transponders and three ROADMs
- The oms attributes are considered for ROADM-to-ROADM links.

JIRA: TRNSPRTPCE-131,TRNSPRTPCE-95

Change-Id: Ia06aa0db56049759ea43a2bf8603f2ede318b7f2
Signed-off-by: Ahmed Triki <ahmed.triki@orange.com>