[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/TapiConnection.java b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiConnection.java
new file mode 100644
index 0000000..f81ec1a
--- /dev/null
+++ b/apps/odtn/api/src/main/java/org/onosproject/odtn/utils/tapi/TapiConnection.java
@@ -0,0 +1,80 @@
+/*
+ * 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.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+public final class TapiConnection {
+
+    private TapiCepPair ceps;
+    private List<TapiConnection> lowerConnections = new ArrayList<>();
+
+    private TapiConnection(TapiCepPair ceps) {
+        this.ceps = ceps;
+    }
+
+    public static TapiConnection create(TapiCepPair ceps) {
+        return new TapiConnection(ceps);
+    }
+
+    public static TapiConnection create(TapiCepRef left, TapiCepRef right) {
+        TapiCepPair cepPair = TapiCepPair.create(left, right);
+        return new TapiConnection(cepPair);
+    }
+
+    public TapiCepPair getCeps() {
+        return ceps;
+    }
+
+    public List<TapiConnection> getLowerConnections() {
+        return lowerConnections;
+    }
+
+    public TapiConnection addLowerConnection(TapiConnection lowerConnection) {
+        this.lowerConnections.add(lowerConnection);
+        return this;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("ceps", ceps)
+                .add("lowerConnection", lowerConnections)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof TapiConnection)) {
+            return false;
+        }
+        TapiConnection that = (TapiConnection) o;
+        return Objects.equals(ceps, that.ceps) &&
+                Objects.equals(lowerConnections, that.lowerConnections);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(ceps, lowerConnections);
+    }
+}