BGP router now handles the case where groups don't exists right away.

Also reworked some logic to make delete routes work.

Change-Id: I1f65279284b85144a847f1295fcbd7695cb59167
diff --git a/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java b/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
index 6fb5d0a..cae79eb 100644
--- a/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
+++ b/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
@@ -310,7 +310,7 @@
                         break;
                     }
                 default:
-                    log.debug("Unhandled message type: {}", msg.getType());
+                    break;
             }
         }