CORD-176, CORD-431 Switch to new VTN API

- Implemented VTN store and manager to keep network states
- Implemented the new VTN API for service network and port

Change-Id: Id8f5d0e609fa3deba782ff2265fc0d3175cbcb4c
diff --git a/src/main/java/org/opencord/cordvtn/api/ProviderNetwork.java b/src/main/java/org/opencord/cordvtn/api/ProviderNetwork.java
new file mode 100644
index 0000000..9caabbd
--- /dev/null
+++ b/src/main/java/org/opencord/cordvtn/api/ProviderNetwork.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.opencord.cordvtn.api;
+
+import com.google.common.base.MoreObjects;
+import org.opencord.cordvtn.api.Dependency.Type;
+
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Representation of a provider network.
+ */
+public final class ProviderNetwork {
+
+    private final NetworkId id;
+    private final Type type;
+
+    private ProviderNetwork(NetworkId id, Type type) {
+        this.id = id;
+        this.type = type;
+    }
+
+    /**
+     * Returns network id.
+     *
+     * @return network id
+     */
+    public NetworkId id() {
+        return id;
+    }
+
+    /**
+     * Returns the direct access type with this provider network.
+     *
+     * @return direct access type
+     */
+    public Type type() {
+        return type;
+    }
+
+    /**
+     * Returns immutable provider network with the supplied network id and type.
+     *
+     * @param id   network id
+     * @param type direct access type
+     * @return provider network
+     */
+    public static ProviderNetwork of(NetworkId id, Type type) {
+        checkNotNull(id);
+        checkNotNull(type);
+        return new ProviderNetwork(id, type);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+
+        if (obj instanceof ProviderNetwork) {
+            ProviderNetwork that = (ProviderNetwork) obj;
+            if (Objects.equals(id, that.id) &&
+                    Objects.equals(type, that.type)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, type);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("id", id)
+                .add("type", type)
+                .toString();
+    }
+}