Initial set of Fabric switch test cases

Change-Id: I86fd2b67d3b773aa496f5ef61f1e1fdf51fd9925
diff --git a/Fabric/Utilities/src/python/oftest/mpls.py b/Fabric/Utilities/src/python/oftest/mpls.py
new file mode 100644
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+++ b/Fabric/Utilities/src/python/oftest/mpls.py
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+
+# 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.
+
+
+# Imported from scapy at revision 1270:113ef25f9583
+# This file is not included in the Ubuntu packages of scapy, so it is checked
+# in to our repo to simplify installation. This file is under the GPLv2.
+
+# http://trac.secdev.org/scapy/ticket/31 
+
+# scapy.contrib.description = MPLS
+# scapy.contrib.status = loads
+
+from scapy.packet import Packet,bind_layers
+from scapy.fields import BitField,ByteField
+from scapy.layers.l2 import Ether
+
+class MPLS(Packet): 
+   name = "MPLS" 
+   fields_desc =  [ BitField("label", 3, 20), 
+                    BitField("cos", 0, 3), 
+                    BitField("s", 1, 1), 
+                    ByteField("ttl", 0)  ] 
+
+bind_layers(Ether, MPLS, type=0x8847)
+
+# Not in upstream scapy
+bind_layers(MPLS, MPLS, s=0)