Adding route subsystem code to support EVPN

Change-Id: I5d9715af8e2a9474892267c97cd4763f12be4816
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnInstanceName.java b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnInstanceName.java
new file mode 100644
index 0000000..ee63cf4
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/routing/EvpnInstanceName.java
@@ -0,0 +1,79 @@
+/*
+ * 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 java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Represents the EvpnInstanceName.
+ */
+public final class EvpnInstanceName {
+    private final String evpnName;
+
+    /**
+     * Constructor to initialize the parameters.
+     *
+     * @param evpnName EvpnInstanceName
+     */
+    private EvpnInstanceName(String evpnName) {
+        this.evpnName = evpnName;
+    }
+
+    /**
+     * Creates instance of EvpnInstanceName.
+     *
+     * @param evpnName evpnName
+     * @return evpnInstanceName
+     */
+    public static EvpnInstanceName evpnName(String evpnName) {
+        return new EvpnInstanceName(evpnName);
+    }
+
+    /**
+     * Get vpn instance name.
+     *
+     * @return evpnName
+     */
+    public String getEvpnName() {
+        return evpnName;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(evpnName);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj instanceof EvpnInstanceName) {
+            EvpnInstanceName other = (EvpnInstanceName) obj;
+            return Objects.equals(this.evpnName, other.evpnName);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add("evpnName", evpnName).toString();
+    }
+}