Implemented the following PW features and fixes:

   - PW support for H-AGG topologies. Support for leaf-spine-spine
     leaf-spine-spine-leaf pseudowires.
   - Renamed pw commands with sr-pw-* pattern and also removed redundant output
    from them.
   - Enabled bulk addition / removal of pws from the rest api.
   - Modified diagnostics tool with the updated command name.

Change-Id: I708db9281d0082b160cbd713910b420ef7df9da3
diff --git a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/pwaas/L2TunnelHandler.java b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/pwaas/L2TunnelHandler.java
index 5fce137..ad4f50a 100644
--- a/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/pwaas/L2TunnelHandler.java
+++ b/apps/segmentrouting/app/src/main/java/org/onosproject/segmentrouting/pwaas/L2TunnelHandler.java
@@ -25,6 +25,13 @@
     void init();
 
     /**
+     * Combines policies and tunnels to create descriptions.
+     *
+     * @return Set of l2 tunnel descriptions.
+     */
+    Set<L2TunnelDescription> getL2Descriptions();
+
+    /**
      * Returns a copy of the l2 policies that exist in the store.
      *
      * @return The l2 policies