Merge branch 'pr-service-handler-p4' into 'develop'

src/common/tools/object_factory/Service.py

src/service/service/service_handler_api/FilterFields.py

src/service/service/service_handlers/__init__.py

src/service/service/service_handlers/p4/__init__.py

...service/service/service_handlers/p4/p4_service_handler.py

src/service/tests/test_unitary.py

src/tests/p4/__init__.py

src/tests/p4/deploy_specs.sh

src/tests/p4/mininet/1switch1path.py

src/tests/p4/mininet/2switch1path.py

src/tests/p4/mininet/4switch2path.py

src/tests/p4/mininet/6switch2path.py

src/tests/p4/p4/bmv2.json

src/tests/p4/p4/main.p4

src/tests/p4/p4/p4info.txt

src/tests/p4/run_test_01_bootstrap.sh

src/tests/p4/run_test_02_create_service.sh

src/tests/p4/run_test_03_delete_service.sh

src/tests/p4/run_test_04_cleanup.sh

src/tests/p4/setup.sh