Add support for ansible playbook configuration in L3 core service workflows

gso/workflows/l3_core_service/base_modify_l3_core_service.py

...workflows/l3_core_service/copernicus/modify_copernicus.py

gso/workflows/l3_core_service/geant_ip/modify_geant_ip.py

gso/workflows/l3_core_service/ias/modify_ias.py

gso/workflows/l3_core_service/lhcone/modify_lhcone.py

...s/l3_core_service/r_and_e_lhcone/modify_r_and_e_lhcone.py

...flows/l3_core_service/r_and_e_peer/modify_r_and_e_peer.py

.../workflows/l3_core_service/test_modify_l3_core_service.py