ixia-c tests can fail if protobuf already installed with incompatible version

[chrispsommers]

Use of snappi package 0.7.37 as specified in https://github.com/Azure/DASH/blob/main/test/requirements.txt could cause snappi client errors if an incompatible version of protobuf python package is already installed.

Per ixia-c support Slack channel (https://ixia-c.slack.com/archives/C021DU5026R/p1657894469742489?thread_ts=1657847300.692199&cid=C021DU5026R), this can be fixed by upgrading to snappi 0.7.38. I will file a PR to do so.

An example error output is show below:

dash@chris-z4:~/chris-dash/DASH/dash-pipeline$ make run-all-tests 
# Ensure P4Runtime server is listening
t=5; \
while [ ${t} -ge 1 ]; do \
	if sudo lsof -i:9559 | grep LISTEN >/dev/null; then \
		break; \
	else \
		sleep 1; \
		t=`expr $t - 1`; \
	fi; \
done; \
docker exec -w /tests/vnet_out simple_switch-dash ./vnet_out
GRPC call SetForwardingPipelineConfig 0.0.0.0:9559 => /etc/dash/dash_pipeline.json, /etc/dash/dash_pipeline_p4rt.txt
GRPC call Write::add_one_entry OK: GRPC call Write::add_one_entry OK: GRPC call Write::add_one_entry OK: Done.
python3 -m pip install -r ../test/requirements.txt
Requirement already satisfied: snappi==0.7.37 in /home/dash/.local/lib/python3.8/site-packages (from -r ../test/requirements.txt (line 1)) (0.7.37)
Requirement already satisfied: pytest==6.0.1 in /home/dash/.local/lib/python3.8/site-packages (from -r ../test/requirements.txt (line 2)) (6.0.1)
Requirement already satisfied: urllib3 in /usr/lib/python3/dist-packages (from snappi==0.7.37->-r ../test/requirements.txt (line 1)) (1.25.8)
Requirement already satisfied: grpcio-tools==1.44.0; python_version > "2.7" in /home/dash/.local/lib/python3.8/site-packages (from snappi==0.7.37->-r ../test/requirements.txt (line 1)) (1.44.0)
Requirement already satisfied: PyYAML in /usr/lib/python3/dist-packages (from snappi==0.7.37->-r ../test/requirements.txt (line 1)) (5.3.1)
Requirement already satisfied: grpcio==1.44.0; python_version > "2.7" in /home/dash/.local/lib/python3.8/site-packages (from snappi==0.7.37->-r ../test/requirements.txt (line 1)) (1.44.0)
Requirement already satisfied: requests in /usr/lib/python3/dist-packages (from snappi==0.7.37->-r ../test/requirements.txt (line 1)) (2.22.0)
Requirement already satisfied: pluggy<1.0,>=0.12 in /home/dash/.local/lib/python3.8/site-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (0.13.1)
Requirement already satisfied: more-itertools>=4.0.0 in /usr/lib/python3/dist-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (4.2.0)
Requirement already satisfied: toml in /home/dash/.local/lib/python3.8/site-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (0.10.2)
Requirement already satisfied: attrs>=17.4.0 in /usr/lib/python3/dist-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (19.3.0)
Requirement already satisfied: py>=1.8.2 in /home/dash/.local/lib/python3.8/site-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (1.11.0)
Requirement already satisfied: packaging in /home/dash/.local/lib/python3.8/site-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (21.3)
Requirement already satisfied: iniconfig in /home/dash/.local/lib/python3.8/site-packages (from pytest==6.0.1->-r ../test/requirements.txt (line 2)) (1.1.1)
Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (from grpcio-tools==1.44.0; python_version > "2.7"->snappi==0.7.37->-r ../test/requirements.txt (line 1)) (45.2.0)
Requirement already satisfied: protobuf<4.0dev,>=3.5.0.post1 in /usr/local/lib/python3.8/dist-packages (from grpcio-tools==1.44.0; python_version > "2.7"->snappi==0.7.37->-r ../test/requirements.txt (line 1)) (3.6.1)
Requirement already satisfied: six>=1.5.2 in /usr/lib/python3/dist-packages (from grpcio==1.44.0; python_version > "2.7"->snappi==0.7.37->-r ../test/requirements.txt (line 1)) (1.14.0)
Requirement already satisfied: pyparsing!=3.0.5,>=2.0.2 in /home/dash/.local/lib/python3.8/site-packages (from packaging->pytest==6.0.1->-r ../test/requirements.txt (line 2)) (3.0.9)
cd ../test/third-party/traffic_gen && ./deploy_ixiac.sh
.
deployment_traffic_engine_1_1 is up-to-date
deployment_controller_1 is up-to-date
deployment_traffic_engine_2_1 is up-to-date
# Ensure P4Runtime server is listening
t=5; \
while [ ${t} -ge 1 ]; do \
	if sudo lsof -i:9559 | grep LISTEN >/dev/null; then \
		break; \
	else \
		sleep 1; \
		t=`expr $t - 1`; \
	fi; \
done; \
docker exec -w /tests/init_switch simple_switch-dash ./init_switch
GRPC call SetForwardingPipelineConfig 0.0.0.0:9559 => /etc/dash/dash_pipeline.json, /etc/dash/dash_pipeline_p4rt.txt
Switch is initialized.
python3 -m pytest ../test/test-cases/bmv2_model/ -s
================================================================================================== test session starts ===================================================================================================
platform linux -- Python 3.8.10, pytest-6.0.1, py-1.11.0, pluggy-0.13.1
rootdir: /home/dash/chris-dash/DASH
collected 0 items / 1 error                                                                                                                                                                                              

========================================================================================================= ERRORS =========================================================================================================
____________________________________________________________________________ ERROR collecting test/test-cases/bmv2_model/test_hello_world.py _____________________________________________________________________________
../../../.local/lib/python3.8/site-packages/snappi/otg_pb2_grpc.py:7: in <module>
    import otg_pb2 as otg__pb2
E   ModuleNotFoundError: No module named 'otg_pb2'

During handling of the above exception, another exception occurred:
../test/test-cases/bmv2_model/test_hello_world.py:1: in <module>
    import snappi
../../../.local/lib/python3.8/site-packages/snappi/__init__.py:1: in <module>
    from .snappi import Config
../../../.local/lib/python3.8/site-packages/snappi/snappi.py:17: in <module>
    from snappi import otg_pb2_grpc as pb2_grpc
../../../.local/lib/python3.8/site-packages/snappi/otg_pb2_grpc.py:9: in <module>
    from snappi import otg_pb2 as otg__pb2
../../../.local/lib/python3.8/site-packages/snappi/otg_pb2.py:23: in <module>
    _CONFIG = DESCRIPTOR.message_types_by_name['Config']
E   AttributeError: 'NoneType' object has no attribute 'message_types_by_name'
==================================================================================================== warnings summary ====================================================================================================
/usr/local/lib/python3.8/dist-packages/google/protobuf/internal/containers.py:182
  /usr/local/lib/python3.8/dist-packages/google/protobuf/internal/containers.py:182: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
    MutableMapping = collections.MutableMapping

/usr/local/lib/python3.8/dist-packages/google/protobuf/internal/containers.py:340
  /usr/local/lib/python3.8/dist-packages/google/protobuf/internal/containers.py:340: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
    collections.MutableSequence.register(BaseContainer)

-- Docs: https://docs.pytest.org/en/stable/warnings.html
================================================================================================ short test summary info =================================================================================================
ERROR ../test/test-cases/bmv2_model/test_hello_world.py - AttributeError: 'NoneType' object has no attribute 'message_types_by_name'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
============================================================================================== 2 warnings, 1 error in 0.98s ==============================================================================================
make: *** [Makefile:355: run-ixiac-test] Error 2