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/bundle_prop.py b/python/ofagent/loxi/of14/bundle_prop.py
new file mode 100644
index 0000000..6a36f28
--- /dev/null
+++ b/python/ofagent/loxi/of14/bundle_prop.py
@@ -0,0 +1,138 @@
+# 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 module.py
+# Do not modify
+
+import struct
+import loxi
+import util
+import loxi.generic_util
+
+import sys
+ofp = sys.modules['loxi.of14']
+
+class bundle_prop(loxi.OFObject):
+    subtypes = {}
+
+
+    def __init__(self, type=None):
+        if type != None:
+            self.type = type
+        else:
+            self.type = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        subtype, = reader.peek('!H', 0)
+        subclass = bundle_prop.subtypes.get(subtype)
+        if subclass:
+            return subclass.unpack(reader)
+
+        obj = bundle_prop()
+        obj.type = reader.read("!H")[0]
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.type != other.type: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("bundle_prop {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+            q.breakable()
+        q.text('}')
+
+
+class experimenter(bundle_prop):
+    subtypes = {}
+
+    type = 65535
+
+    def __init__(self, experimenter=None, exp_type=None):
+        if experimenter != None:
+            self.experimenter = experimenter
+        else:
+            self.experimenter = 0
+        if exp_type != None:
+            self.exp_type = exp_type
+        else:
+            self.exp_type = 0
+        return
+
+    def pack(self):
+        packed = []
+        packed.append(struct.pack("!H", self.type))
+        packed.append(struct.pack("!H", 0)) # placeholder for length at index 1
+        packed.append(struct.pack("!L", self.experimenter))
+        packed.append(struct.pack("!L", self.exp_type))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        subtype, = reader.peek('!L', 4)
+        subclass = experimenter.subtypes.get(subtype)
+        if subclass:
+            return subclass.unpack(reader)
+
+        obj = experimenter()
+        _type = reader.read("!H")[0]
+        assert(_type == 65535)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.experimenter = reader.read("!L")[0]
+        obj.exp_type = reader.read("!L")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.experimenter != other.experimenter: return False
+        if self.exp_type != other.exp_type: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("experimenter {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("exp_type = ");
+                q.text("%#x" % self.exp_type)
+            q.breakable()
+        q.text('}')
+
+bundle_prop.subtypes[65535] = experimenter
+
+