Add HTTP Server and gRPC Server

src/ztp_server/tests/data/test-ietf-network.json

src/ztp_server/tests/data/tfs_api_dummy.json

src/ztp_server/tests/data/topology-7router-emu-dummy.json

src/ztp_server/tests/data/topology-7router-emu.json

src/ztp_server/tests/data/topology-dummy.json

src/ztp_server/tests/data/topology-real.json

src/ztp_server/tests/ietf_acl_client.py

src/ztp_server/tests/test_etsi_bwm.py

src/ztp_server/tests/test_ietf_l2vpn.py

src/ztp_server/tests/test_ietf_l3vpn.py

src/ztp_server/tests/test_ietf_network.py

src/ztp_server/tests/test_slice.py

src/ztp_server/tests/test_tfs_api.py

src/ztp_server/tests/test_yang_acl.py