Add a builder for DefaultLink to hide multiplying constructors

Change-Id: Iaf073d07989c398a8f44541ffdb8dd93e5715162
diff --git a/core/store/dist/src/main/java/org/onosproject/store/link/impl/ECLinkStore.java b/core/store/dist/src/main/java/org/onosproject/store/link/impl/ECLinkStore.java
index 48851f7..8e77ac8 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/link/impl/ECLinkStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/link/impl/ECLinkStore.java
@@ -317,7 +317,15 @@
         });
 
         boolean isDurable = Objects.equals(annotations.get().value(AnnotationKeys.DURABLE), "true");
-        return new DefaultLink(baseProviderId, src, dst, type, ACTIVE, isDurable, annotations.get());
+        return DefaultLink.builder()
+                .providerId(baseProviderId)
+                .src(src)
+                .dst(dst)
+                .type(type)
+                .state(ACTIVE)
+                .isExpected(isDurable)
+                .annotations(annotations.get())
+                .build();
     }
 
     // Updates, if necessary the specified link and returns the appropriate event.
@@ -346,11 +354,15 @@
             // FIXME: this will not sync link state!!!
             return link.state() == INACTIVE ? null :
                     updateLink(linkKey(link.src(), link.dst()), link,
-                               new DefaultLink(link.providerId(),
-                                               link.src(), link.dst(),
-                                               link.type(), INACTIVE,
-                                               link.isDurable(),
-                                               link.annotations()));
+                               DefaultLink.builder()
+                                       .providerId(link.providerId())
+                                       .src(link.src())
+                                       .dst(link.dst())
+                                       .type(link.type())
+                                       .state(INACTIVE)
+                                       .isExpected(link.isExpected())
+                                       .annotations(link.annotations())
+                                       .build());
         }
         return removeLink(src, dst);
     }