[AETHER-76] Impelentation of a new Trellis Troubleshoot Tool (T3) for offline mode

- For the performance improvement, T3 offline mode uses snapshots of the network states
called Network Information Base (NIB) instead of runtime interactions with ONOS core
during troubleshooting a Trellis system.
- Partially tested with some mininet topos for trellis
(https://github.com/opennetworkinglab/routing/tree/master/trellis).
- Usage instruction docs (https://docs.trellisfabric.org/troubleshooting.html).

Change-Id: Ice608f77aa96bfbcadfff34991c4a1b6d93125b6
(cherry picked from commit eaa6329aba67c2577fdca7d3ddf230611e82f9f7)
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/EncodeInstructionCodecHelper.java b/core/common/src/main/java/org/onosproject/codec/impl/EncodeInstructionCodecHelper.java
index 0d67eff..996fa8c 100644
--- a/core/common/src/main/java/org/onosproject/codec/impl/EncodeInstructionCodecHelper.java
+++ b/core/common/src/main/java/org/onosproject/codec/impl/EncodeInstructionCodecHelper.java
@@ -315,6 +315,8 @@
         }
 
         if (device.is(ExtensionTreatmentCodec.class)) {
+            // for extension instructions, encoding device id is needed for the corresponding decoder
+            result.put("deviceId", deviceId.toString());
             ExtensionTreatmentCodec treatmentCodec = device.as(ExtensionTreatmentCodec.class);
             ObjectNode node = treatmentCodec.encode(extensionInstruction.extensionInstruction(), context);
             result.set(InstructionCodec.EXTENSION, node);