Pass instance ID while starting orchagent process. Getting Azure#4465…

… in 201911 (#4514)

dockers/docker-orchagent/orchagent.sh

@@ -17,6 +17,22 @@ ORCHAGENT_ARGS="-d /var/log/swss "
 # Set orchagent pop batch size to 8192
 ORCHAGENT_ARGS+="-b 8192 "
 
+# Check if there is an "asic_id field" in the DEVICE_METADATA in configDB.
+#"DEVICE_METADATA": {
+#    "localhost": {
+#        ....
+#        "asic_id": "0",
+#    }
+#},
+# ID field could be integers just to denote the asic instance like 0,1,2...
+# OR could be PCI device ID's which will be strings like "03:00.0"
+# depending on what the SAI/SDK expects.
+asic_id=`sonic-cfggen -d -v DEVICE_METADATA.localhost.asic_id`
+if [ -n "$asic_id" ]
+then
+    ORCHAGENT_ARGS+="-i $asic_id "
+fi
+
 # Add platform specific arguments if necessary
 if [ "$platform" == "broadcom" ]; then
     ORCHAGENT_ARGS+="-m $MAC_ADDRESS"