Adding logging for the gRPC channel as default and host configuration for mininet topo

Change-Id: I3e5fe43c68f8003ea0279c11f64d7429aa82cf1b
diff --git a/sdfabric/dev-values.yaml b/sdfabric/dev-values.yaml
index df1613e..68c1e51 100644
--- a/sdfabric/dev-values.yaml
+++ b/sdfabric/dev-values.yaml
@@ -112,6 +112,10 @@
         {
           "phasedRecovery": true
         }
+      "org.onosproject.grpc.ctl.GrpcChannelControllerImpl": >
+        {
+          "enableMessageLog": true
+        }
     netcfg: >
       {
         "devices": {
@@ -236,6 +240,30 @@
                 ]
               }
             ]
+          },
+          "device:leaf2/3": {
+            "interfaces": [
+              {
+                "name": "leaf2-3",
+                "ips": [
+                  "172.16.3.254/24"
+                ],
+                "vlan-tagged": [
+                  300
+                ]
+              }
+            ]
+          },
+          "device:leaf2/4": {
+            "interfaces": [
+              {
+                "name": "leaf2-4",
+                "ips": [
+                  "172.16.4.254/24"
+                ],
+                "vlan-untagged": 100
+              }
+            ]
           }
         },
         "hosts": {