[ODTN] Add read/create/delete ConnectivityService RPC

- RPC: get service interface point
- RPC: get connectivity service list
- RPC: get connectivity service detail
- RPC: create connectivity service
- RPC: delete connectivity service

- Filter method of TAPI resolver for both Node / NEP
- Change condition for sip to odtn-port-type
- Use odtn-port-type in path-computation mock
- Create CEP at topology discovery

- Add sample path calculator
- Add connection-id based path selection

Change-Id: I2f08aacb3dd14b6b3c59a64a349e50abb495f70b
diff --git a/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiContextHandler.java b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiContextHandler.java
new file mode 100644
index 0000000..ff8e24d
--- /dev/null
+++ b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiContextHandler.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2018-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.odtn.utils.tapi;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.onosproject.yang.gen.v1.tapicommon.rev20180307.tapicommon.DefaultContext;
+import org.onosproject.yang.gen.v1.tapicommon.rev20180307.tapicommon.Uuid;
+import org.onosproject.yang.gen.v1.tapiconnectivity.rev20180307.tapiconnectivity.connectivitycontext.DefaultConnectivityService;
+import org.onosproject.yang.gen.v1.tapiconnectivity.rev20180307.tapiconnectivity.context.DefaultAugmentedTapiCommonContext;
+import org.onosproject.yang.gen.v1.tapitopology.rev20180307.tapitopology.topologycontext.DefaultTopology;
+import org.onosproject.yang.model.DefaultModelObjectData;
+import org.onosproject.yang.model.ModelObjectData;
+import org.onosproject.yang.model.ModelObjectId;
+
+/**
+ * Utility class to deal with TAPI Context with DCS.
+ */
+public final class TapiContextHandler extends TapiObjectHandler<DefaultContext> {
+
+    private TapiContextHandler() {
+        obj = new DefaultContext();
+    }
+
+    public static TapiContextHandler create() {
+        return new TapiContextHandler();
+    }
+
+    @Override
+    protected Uuid getIdDetail() {
+        return null;
+    }
+
+    @Override
+    protected void setIdDetail(Uuid uuid) {
+    }
+
+    @Override
+    public ModelObjectId getParentModelObjectId() {
+        return ModelObjectId.builder().build();
+    }
+
+    @Override
+    public ModelObjectData getChildModelObjectData() {
+
+        ModelObjectId mId = ModelObjectId.builder()
+                .addChild(DefaultContext.class)
+                .build();
+
+        DefaultTopology mObj = new DefaultTopology();
+
+        return DefaultModelObjectData.builder()
+                .addModelObject(mObj)
+                .identifier(mId)
+                .build();
+    }
+
+    public List<TapiConnectivityServiceHandler> getConnectivityServices() {
+
+        DefaultAugmentedTapiCommonContext augmentedContext = obj.augmentation(DefaultAugmentedTapiCommonContext.class);
+        try {
+            return augmentedContext.connectivityService().stream()
+                    .map(connectivityService -> {
+                        TapiConnectivityServiceHandler handler = TapiConnectivityServiceHandler.create();
+                        handler.setModelObject((DefaultConnectivityService) connectivityService);
+                        return handler;
+                    }).collect(Collectors.toList());
+        } catch (NullPointerException e) {
+            return Collections.emptyList();
+        }
+    }
+
+}