TE Topoplogy subsystem I2RS API changes

This submission contains the following:

1. Major changes in apps/tetopology. The changes are mainly introduced
   to support new searching keys in TE Topology.

2. Add RESTCONF notification support in the TE Provider. i.e., for
   south-bound RESTCONF communication with the domain controller.

Change-Id: I6786959deb66c98626edc65ff52694dcf08981a3
diff --git a/apps/tetopology/api/src/main/java/org/onosproject/tetopology/management/api/CommonTopologyData.java b/apps/tetopology/api/src/main/java/org/onosproject/tetopology/management/api/CommonTopologyData.java
new file mode 100644
index 0000000..e8b901f
--- /dev/null
+++ b/apps/tetopology/api/src/main/java/org/onosproject/tetopology/management/api/CommonTopologyData.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2016 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.onosproject.tetopology.management.api;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+import org.onosproject.net.DeviceId;
+
+import java.util.BitSet;
+
+/**
+ * Representation of topology common attributes.
+ */
+public class CommonTopologyData {
+    private final OptimizationType optimization;
+    private final BitSet flags;
+    private final KeyId networkId;
+    private final DeviceId ownerId;
+
+    /**
+     * Create an instance of CommonTopologyData.
+     *
+     * @param networkId    the network identifier
+     * @param optimization the TE topology optimization criteria
+     * @param flags        the topology characteristics flags
+     * @param ownerId      the controller identifier owning this topology
+     */
+    public CommonTopologyData(KeyId networkId, OptimizationType optimization,
+                              BitSet flags, DeviceId ownerId) {
+        this.optimization = optimization;
+        this.flags = flags;
+        this.networkId = networkId;
+        this.ownerId = ownerId;
+    }
+
+    /**
+     * Creates an instance of CommonTopologyData from a given TE topology.
+     *
+     * @param teTopology the given TE Topology
+     */
+    public CommonTopologyData(TeTopology teTopology) {
+        optimization = teTopology.optimization();
+        flags = teTopology.flags();
+        networkId = teTopology.networkId();
+        ownerId = teTopology.ownerId();
+    }
+
+
+    /**
+     * Returns the topology optimization type.
+     *
+     * @return the optimization type
+     */
+    public OptimizationType optimization() {
+        return optimization;
+    }
+
+    /**
+     * Returns the network identifier.
+     *
+     * @return the network id
+     */
+    public KeyId networkId() {
+        return networkId;
+    }
+
+    /**
+     * Returns the topology characteristics flags.
+     *
+     * @return the flags
+     */
+    public BitSet flags() {
+        return flags;
+    }
+
+    /**
+     * Returns the SDN controller identifier owning this topology.
+     *
+     * @return the SDN controller id
+     */
+    public DeviceId ownerId() {
+        return ownerId;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(optimization, flags, ownerId, networkId);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (object instanceof CommonTopologyData) {
+            CommonTopologyData that = (CommonTopologyData) object;
+            return Objects.equal(optimization, that.optimization) &&
+                    Objects.equal(flags, that.flags) &&
+                    Objects.equal(networkId, that.networkId) &&
+                    Objects.equal(ownerId, that.ownerId);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("optimization", optimization)
+                .add("flags", flags)
+                .add("ownerId", ownerId)
+                .add("networkId", networkId)
+                .toString();
+    }
+}