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/port_mod_prop.py b/python/ofagent/loxi/of14/port_mod_prop.py
new file mode 100644
index 0000000..0c6f647
--- /dev/null
+++ b/python/ofagent/loxi/of14/port_mod_prop.py
@@ -0,0 +1,272 @@
+# 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 port_mod_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 = port_mod_prop.subtypes.get(subtype)
+        if subclass:
+            return subclass.unpack(reader)
+
+        obj = port_mod_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("port_mod_prop {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+            q.breakable()
+        q.text('}')
+
+
+class ethernet(port_mod_prop):
+    type = 0
+
+    def __init__(self, advertise=None):
+        if advertise != None:
+            self.advertise = advertise
+        else:
+            self.advertise = 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.advertise))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = ethernet()
+        _type = reader.read("!H")[0]
+        assert(_type == 0)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.advertise = reader.read("!L")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.advertise != other.advertise: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("ethernet {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("advertise = ");
+                q.text("%#x" % self.advertise)
+            q.breakable()
+        q.text('}')
+
+port_mod_prop.subtypes[0] = ethernet
+
+class experimenter(port_mod_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('}')
+
+port_mod_prop.subtypes[65535] = experimenter
+
+class optical(port_mod_prop):
+    type = 1
+
+    def __init__(self, configure=None, freq_ldma=None, fl_offset=None, grid_span=None, tx_pwr=None):
+        if configure != None:
+            self.configure = configure
+        else:
+            self.configure = 0
+        if freq_ldma != None:
+            self.freq_ldma = freq_ldma
+        else:
+            self.freq_ldma = 0
+        if fl_offset != None:
+            self.fl_offset = fl_offset
+        else:
+            self.fl_offset = 0
+        if grid_span != None:
+            self.grid_span = grid_span
+        else:
+            self.grid_span = 0
+        if tx_pwr != None:
+            self.tx_pwr = tx_pwr
+        else:
+            self.tx_pwr = 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.configure))
+        packed.append(struct.pack("!L", self.freq_ldma))
+        packed.append(struct.pack("!L", self.fl_offset))
+        packed.append(struct.pack("!L", self.grid_span))
+        packed.append(struct.pack("!L", self.tx_pwr))
+        length = sum([len(x) for x in packed])
+        packed[1] = struct.pack("!H", length)
+        return ''.join(packed)
+
+    @staticmethod
+    def unpack(reader):
+        obj = optical()
+        _type = reader.read("!H")[0]
+        assert(_type == 1)
+        _length = reader.read("!H")[0]
+        orig_reader = reader
+        reader = orig_reader.slice(_length, 4)
+        obj.configure = reader.read("!L")[0]
+        obj.freq_ldma = reader.read("!L")[0]
+        obj.fl_offset = reader.read("!L")[0]
+        obj.grid_span = reader.read("!L")[0]
+        obj.tx_pwr = reader.read("!L")[0]
+        return obj
+
+    def __eq__(self, other):
+        if type(self) != type(other): return False
+        if self.configure != other.configure: return False
+        if self.freq_ldma != other.freq_ldma: return False
+        if self.fl_offset != other.fl_offset: return False
+        if self.grid_span != other.grid_span: return False
+        if self.tx_pwr != other.tx_pwr: return False
+        return True
+
+    def pretty_print(self, q):
+        q.text("optical {")
+        with q.group():
+            with q.indent(2):
+                q.breakable()
+                q.text("configure = ");
+                q.text("%#x" % self.configure)
+                q.text(","); q.breakable()
+                q.text("freq_ldma = ");
+                q.text("%#x" % self.freq_ldma)
+                q.text(","); q.breakable()
+                q.text("fl_offset = ");
+                q.text("%#x" % self.fl_offset)
+                q.text(","); q.breakable()
+                q.text("grid_span = ");
+                q.text("%#x" % self.grid_span)
+                q.text(","); q.breakable()
+                q.text("tx_pwr = ");
+                q.text("%#x" % self.tx_pwr)
+            q.breakable()
+        q.text('}')
+
+port_mod_prop.subtypes[1] = optical
+
+