VOL-3419: Replicate voltha flows in openolt agent
- Use the flow_id, symmetric_flow_id, replication_flag and pbit_to_gemport_map
  coming in Flow proto messge to replicate the flow as needed
- Use the CreateQueues and RemoveQueues messages to setup and remove gem_ports
- Use latest gRPC version 1.31.1 which allows fine tuning of gRPC threadpools
  which allows for greating performance.
- Performance numbers when tested with openolt-scale-tester has been better with
  using latest gRPC and threadpool tuning when compared to earlier. It is to be
  noted that the performance is better even with openolt-agent replicating the flow
  now.
- Scale tests with 512 subscribers have been successfull with BAL3.4.7.5 version
- Use openolt proto version 4.0.0
- Use openolt-test (for unit test) image version 2.0.1 (which bundles latest gRPC version 1.31.1)
- These changes are NOT backward compatible and openolt-agent will have a major
  version bump to 3.0.0

Change-Id: I715c804bdf342e60d08cab6c59e1c21b8c5ac1f4
diff --git a/protos/Makefile b/protos/Makefile
index 6f7ed0b..2618db3 100644
--- a/protos/Makefile
+++ b/protos/Makefile
@@ -18,9 +18,8 @@
 # OpenOLT Proto version.
 # This specifies the GIT tag in https://github.com/opencord/voltha-protos
 # repo that we need to refer to, to pick the right version of
-# openolt.proto and tech_profile.proto
-OPENOLT_PROTO_VER ?= v3.4.5
-GRPC_VER ?= v1.10.x
+# openolt.proto, ext_config.proto and tech_profile.proto
+OPENOLT_PROTO_VER ?= v4.0.2
 
 CXX ?= g++
 CPPFLAGS += `pkg-config --cflags protobuf grpc` -I googleapis/gens -I./
@@ -30,7 +29,7 @@
 GRPC_CPP_PLUGIN = grpc_cpp_plugin
 GRPC_CPP_PLUGIN_PATH ?= $(shell which grpc_cpp_plugin)
 
-OBJS = voltha_protos/common.pb.o voltha_protos/common.grpc.pb.o voltha_protos/tech_profile.pb.o voltha_protos/tech_profile.grpc.pb.o voltha_protos/openolt.pb.o voltha_protos/openolt.grpc.pb.o voltha_protos/ext_config.grpc.pb.o  voltha_protos/ext_config.pb.o ./googleapis/gens/google/api/annotations.grpc.pb.o ./googleapis/gens/google/api/annotations.pb.o ./googleapis/gens/google/api/http.pb.o
+OBJS = voltha_protos/common.pb.o voltha_protos/common.grpc.pb.o voltha_protos/tech_profile.pb.o voltha_protos/tech_profile.grpc.pb.o voltha_protos/ext_config.pb.o voltha_protos/ext_config.grpc.pb.o voltha_protos/openolt.pb.o voltha_protos/openolt.grpc.pb.o ./googleapis/gens/google/api/annotations.grpc.pb.o ./googleapis/gens/google/api/annotations.pb.o ./googleapis/gens/google/api/http.pb.o
 
 .DEFAULT_GOAL := all