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/loxi/of14/__init__.py b/python/ofagent/loxi/of14/__init__.py
new file mode 100644
index 0000000..e256fbb
--- /dev/null
+++ b/python/ofagent/loxi/of14/__init__.py
@@ -0,0 +1,43 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+# Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior University
+# Copyright (c) 2011, 2012 Open Networking Foundation
+# Copyright (c) 2012, 2013 Big Switch Networks, Inc.
+# See the file LICENSE.pyloxi which should have been included in the source distribution
+
+# Automatically generated by LOXI from template init.py
+# Do not modify
+
+import const
+import port_desc_prop
+import bsn_tlv
+import meter_band
+import table_mod_prop
+import instruction
+import queue_desc_prop
+import oxm
+import bundle_prop
+import common
+import instruction_id
+import action
+import role_prop
+import message
+import queue_stats_prop
+import port_stats_prop
+import port_mod_prop
+import async_config_prop
+import action_id
+from const import *
+from common import *
+from loxi import ProtocolError