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/apps/optical-model/src/main/java/org/onosproject/net/optical/device/OpticalDeviceServiceView.java b/apps/optical-model/src/main/java/org/onosproject/net/optical/device/OpticalDeviceServiceView.java
index 88ef950..1e70ff6 100644
--- a/apps/optical-model/src/main/java/org/onosproject/net/optical/device/OpticalDeviceServiceView.java
+++ b/apps/optical-model/src/main/java/org/onosproject/net/optical/device/OpticalDeviceServiceView.java
@@ -202,4 +202,10 @@
         }
     }
 
+
+    @Override
+    public String localStatus(DeviceId deviceId) {
+        return null;
+    }
+
 }