OSPF protocol manual merge from 1.6, due to cherry pick merge conflict

Change-Id: I93653e745468722ce95533537a79e897b4292f5d
diff --git a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java
index 596c593..f389170 100644
--- a/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java
+++ b/protocols/ospf/protocol/src/main/java/org/onosproject/ospf/protocol/lsa/types/NetworkLsa.java
@@ -103,6 +103,16 @@
     }
 
     /**
+     * Gets the list of attached routers.
+     *
+     * @return list of attached routers
+     */
+    public List<Ip4Address> attachedRouters() {
+
+        return attachedRouters;
+    }
+
+    /**
      * Reads from channel buffer and populate instance.
      *
      * @param channelBuffer channel buffer instance