Support in fabric pipeliner for pushing double VLAN tag in Next obj

- Small modification to better support pop and route
- To support route and push we expect to receive a Next Objective with two VLAN_ID
- Added capability to check if the pipeline support double VLAN termination

Change-Id: I8bfbf61ccd838a069121e5ab4a804f695a446bac
(cherry picked from commit f51d0c110af13bd0bfc0d006e070f0e6bbbcd231)
diff --git a/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/FabricIntProgrammable.java b/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/FabricIntProgrammable.java
index d593262..1770576 100644
--- a/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/FabricIntProgrammable.java
+++ b/pipelines/fabric/src/main/java/org/onosproject/pipelines/fabric/FabricIntProgrammable.java
@@ -86,6 +86,23 @@
     private DeviceId deviceId;
     private ApplicationId appId;
 
+    /**
+     * Creates a new instance of this behavior with the given capabilities.
+     *
+     * @param capabilities capabilities
+     */
+    protected FabricIntProgrammable(FabricCapabilities capabilities) {
+        super(capabilities);
+    }
+
+    /**
+     * Create a new instance of this behaviour. Used by the abstract projectable
+     * model (i.e., {@link org.onosproject.net.Device#as(Class)}.
+     */
+    public FabricIntProgrammable() {
+        super();
+    }
+
     private boolean setupBehaviour() {
         deviceId = this.data().deviceId();
         flowRuleService = handler().get(FlowRuleService.class);