Ocata Development LBaaSv2 driver issue with ML2 portbinding extension

Issues:
Fixes #894

Problem: Ocata Development LBaaSv2 driver issue with ML2 portbinding extension

Analysis: As neutron.extensions.portbindings.EXTENDED_NEUTRON_CONST_2_0 dicti
-onar is absent in Ocata, i commented out the lines wherever the
attribute "binding:capabilities" was encountered in the code.

Tests: Created and ran the test "f5lbaasdriver/v2/bigip/test/test_plugin_rpc.py"

Author: kush1093

f5lbaasdriver/v2/bigip/test/test_plugin_rpc.py

@@ -1,10 +1,24 @@
+# Copyright 2016 F5 Networks Inc.
+#
+# 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.
+
 import mock
 import pytest
 
 import neutron.api.v2.attributes
 from neutron_lib import constants as neutron_const
 
-import f5lbaasdriver.v2.bigip.plugin_rpc 
+import f5lbaasdriver.v2.bigip.plugin_rpc
 
 
 @pytest.fixture
@@ -19,21 +33,25 @@ def fully_mocked_target(init):
 @pytest.fixture
 def neutron_attributes(request):
     hold_attributes = neutron.api.v2.attributes
+
     def finalizer():
         neutron.api.v2.attributes = hold_attributes
     request.addfinalizer(finalizer)
     neutron.api.v2.attributes = mock.Mock()
     return neutron.api.v2.attributes
 
+
 @pytest.fixture
 def neutron_extensions(request):
     hold_extensions = neutron.extensions
+
     def finalizer():
         neutron.extensions = hold_extensions
     request.addfinalizer(finalizer)
     neutron.extensions = mock.Mock()
     return neutron.extensions
 
+
 def test_create_port_on_subnet(fully_mocked_target, neutron_attributes,
                                neutron_extensions):
     portbindings = neutron_extensions.portbindings
@@ -51,7 +69,7 @@ def test_create_port_on_subnet(fully_mocked_target, neutron_attributes,
         setattr(portbindings, attr, attr)
     fake_args['vnic_type'] = portbindings.VNIC_NORMAL
     # fake validation data...
-    subnet = {'id': 'subnet_id', 'tenant_id': 'tenant_id', 
+    subnet = {'id': 'subnet_id', 'tenant_id': 'tenant_id',
               'network_id': 'network_id'}
     port = {'id': 'id'}
     device_ips = [{'subnet_id': subnet['id']}]