Support install IntIntents to device with postcard mode

Include the following changes:
 - INT application now can install reuls/configs to the device based on the
   Int intent telemetry mode and the functionality supported by device.
 - Add "Telemetry Mode" option to INT app GUI

Change-Id: I1a9938b076030497a3b2984abe66fed09c190c7d
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntProgrammable.java b/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntProgrammable.java
index 5560e8c..8cbcae0 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntProgrammable.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/inbandtelemetry/IntProgrammable.java
@@ -41,7 +41,11 @@
         /**
          * Transit functionality.
          */
-        TRANSIT
+        TRANSIT,
+        /**
+         * Postcard functionality.
+         */
+        POSTCARD
     }
 
     /**