Adding to the 'devices' cli command an output that displays the local connectivity of a device.
For example, "id=of:0000000000000203, available=true, local-status=connected 18m7s ago, role=STANDBY, ..."
Also increasing the resolution of the TimeAgo utility.

Change-Id: Ie1b89bd193552e0edd38a9ca28c5ce99b1d27c19
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkDeviceManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkDeviceManager.java
index 81bf123..4b9221e 100644
--- a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkDeviceManager.java
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkDeviceManager.java
@@ -182,4 +182,10 @@
     public VirtualNetwork network() {
         return network;
     }
+
+    @Override
+    public String localStatus(DeviceId deviceId) {
+        // TODO not supported at this time
+        return null;
+    }
 }