fix protobuf/grpc, unittests, warnings

.gitlab-ci.yml

CMakeIncludes/grpc_common.cmake

CMakeModules/FindProtobufWithTargets.cmake

CMakeModules/FindgRPC.cmake

consumer/api/cpp/src/fabric_consumer_client.cpp

deploy/build_env/services-linux/Dockerfile

discovery/src/asapo_discovery/protocols/protocol_test.go

receiver/CMakeLists.txt

receiver/docker/Dockerfile