L2SS-278: Fix UDP routing by adding a MTU=9000 network

Use an additional MTU=9000 network to receive UDP through, because our data packets are >1500. The new network needs a name alphabetically before NETWORK_MODE to force Docker to use that to expose our ports on.

Closes L2SS-278

CDB/LOFAR_ConfigDb.json

@@ -710,6 +710,19 @@
                 }
             }
         },
+        "SST": {
+            "LTS": {
+                "SST": {
+                    "LTS/SST/1": {
+                        "properties": {
+                            "SST_Port": [
+                                "5001"
+                            ]
+                        }
+                    }
+                }
+            }
+        },
         "StatsCrosslet": {
             "CS997": {
                 "StatsCrosslet": {