Revert changes in 8117f36b, which modifies the default behavior

If no command line option regarding lambda is supplied,
optical links need to be execluded, but the previous patch broke it.

Change-Id: Ia95e82f7c31fdb16345eb43f1864b58aa4f25acc

@@ -115,7 +115,7 @@ public abstract class ConnectivityIntentCommand extends AbstractShellCommand {
 
     @Option(name = "-l", aliases = "--lambda", description = "Lambda",
             required = false, multiValued = false)
-    private Boolean lambda = null;
+    private boolean lambda = false;
 
     @Option(name = "-a", aliases = "--appId", description = "Application Id",
             required = false, multiValued = false)
@@ -313,12 +313,11 @@ public abstract class ConnectivityIntentCommand extends AbstractShellCommand {
         }
 
         // Check for a lambda specification
-        if (lambda != null) {
         if (lambda) {
             constraints.add(new LambdaConstraint(null));
         }
         constraints.add(new LinkTypeConstraint(lambda, Link.Type.OPTICAL));
-        }
+
         return constraints;
     }