Adding emptyTreatment() and emptySelector()

Note: There was a change that adds a DROP action to
a traffic treatment if there are no other actions present.
To get a traffic treatment without the drop rule, use
emptyTreatment()

Change-Id: I1f23ed5e1fa7519eb94fcafa85facbad815d5e9c
diff --git a/cli/src/main/java/org/onosproject/cli/net/RandomIntentCommand.java b/cli/src/main/java/org/onosproject/cli/net/RandomIntentCommand.java
index b8f25fc..5eb592a 100644
--- a/cli/src/main/java/org/onosproject/cli/net/RandomIntentCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/RandomIntentCommand.java
@@ -67,8 +67,8 @@
     }
 
     private Collection<Intent> generateIntents() {
-        TrafficSelector selector = DefaultTrafficSelector.builder().build();
-        TrafficTreatment treatment = DefaultTrafficTreatment.builder().build();
+        TrafficSelector selector = DefaultTrafficSelector.emptySelector();
+        TrafficTreatment treatment = DefaultTrafficTreatment.emptyTreatment();
 
         List<Host> hosts = Lists.newArrayList(hostService.getHosts());
         List<Intent> fullMesh = Lists.newArrayList();