Adding route subsystem code to support EVPN

Change-Id: I5d9715af8e2a9474892267c97cd4763f12be4816
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteStoreDelegate.java b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteStoreDelegate.java
new file mode 100644
index 0000000..55818e1
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnRouteStoreDelegate.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.incubator.net.routing;
+
+import org.onosproject.store.StoreDelegate;
+
+/**
+ * Route store delegate abstraction.
+ */
+public interface EvpnRouteStoreDelegate extends
+        StoreDelegate<EvpnInternalRouteEvent> {
+}