Adding BGP provider code to support EVPN

Change-Id: Ic5508749b64a47a70f1aabd9324e9f89e85fa39f
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/BgpNlriType.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/BgpNlriType.java
new file mode 100755
index 0000000..29b318d
--- /dev/null
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/BgpNlriType.java
@@ -0,0 +1,34 @@
+/*
+ * 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.bgpio.types;
+
+public enum BgpNlriType {
+
+    /**
+     * Signifies Link State Nlri.
+     */
+    LINK_STATE,
+    /**
+     * Signifies Flow Spec Nlri.
+     */
+    FLOW_SPEC,
+    /**
+     * Signifies Evpn Nlri.
+     */
+    EVPN;
+
+}