VOL-1097 : Ofagent integration for voltha 2.0

- Created a common location for python based components
- Adjusted the ofagent component to interact with voltha 2.0
- Added streaming rpc methods for rcv/send of packets to voltha api
- Adjusted voltha.proto

Change-Id: I47fb7b80878ead060b4b42bd16cb4f8aa384fdb6
diff --git a/python/ofagent/protos/Makefile b/python/ofagent/protos/Makefile
new file mode 100644
index 0000000..c6f5d8c
--- /dev/null
+++ b/python/ofagent/protos/Makefile
@@ -0,0 +1,43 @@
+#
+# Copyright 2017 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Makefile to build all protobuf and gRPC related artifacts
+
+ifeq ($(VOLTHA_BASE)_set,_set)
+  $(error To get started, please source the env.sh file from Voltha top level directory)
+endif
+
+# This makefile is used only to copy relevant *_pb2.py files from Voltha
+# to allow ofagent to function properly.
+
+
+TARGET_PROTO_DIR := $(VOLTHA_BASE)/ofagent/protos
+SOURCE_PROTO_DIR := $(VOLTHA_BASE)/voltha/protos
+TARGET_GOOGLE_API_DIR := $(TARGET_PROTO_DIR)/third_party/google/api
+SOURCE_GOOGLE_API_DIR := $(SOURCE_PROTO_DIR)/third_party/google/api
+
+build: copyfiles
+
+copyfiles:
+	rsync -av --include '*/' --exclude='third_party/__init__.py' --include '*.py' --exclude='*' $(SOURCE_PROTO_DIR)/ $(TARGET_PROTO_DIR)
+	rsync -av --include '*/' --exclude='third_party/__init__.py' --include '*.py' --include '*.desc' --include '*.proto' --exclude='*' $(SOURCE_GOOGLE_API_DIR)/ $(TARGET_GOOGLE_API_DIR)
+
+clean:
+	rm -f $(TARGET_PROTO_DIR)/*_pb2*.py
+	rm -f $(TARGET_GOOGLE_API_DIR)/*_pb2*.py
+	rm -f $(TARGET_GOOGLE_API_DIR)/*_pb2*.pyc
+	rm -f $(TARGET_GOOGLE_API_DIR)/*.proto
+	rm -f $(TARGET_GOOGLE_API_DIR)/*.desc