Merge branch 'feat/device-p4' into 'develop'

src/device/requirements.in

src/device/service/drivers/p4/__init__.py

src/device/service/drivers/p4/p4_client.py

src/device/service/drivers/p4/p4_common.py

src/device/service/drivers/p4/p4_context.py

src/device/service/drivers/p4/p4_driver.py

src/device/service/drivers/p4/p4_exception.py

src/device/service/drivers/p4/p4_global_options.py

src/device/service/drivers/p4/p4_manager.py

src/device/tests/device_p4.py

src/device/tests/mock_p4runtime_service.py

src/device/tests/mock_p4runtime_servicer_impl.py

src/device/tests/p4/test-bmv2.json

src/device/tests/p4/test-p4info.txt

src/device/tests/test_internal_p4.py

src/device/tests/test_unit_p4.py

src/device/tests/test_unitary_p4.py