Add siddhi extensions for operation and notification publishing

src/main/resources/build.properties

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+custom = true

src/main/resources/conf/siddhi-integration.xml

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+<?xml version="1.0" encoding="UTF-8"?><!--
+/*
+ * Copyright (c) 2018, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *
+ * WSO2 Inc. licenses this file to you 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.
+ */
+ -->
+
+<SiddhiExtensionConfiguration>
+	<DCREndpoint>https://${iot.gateway.host}:${iot.gateway.https.port}/api-application-registration/register</DCREndpoint>
+	<GatewayEndpoint>https://${iot.gateway.host}:${iot.gateway.https.port}</GatewayEndpoint>
+	<Username>admin</Username>
+	<Password>admin</Password>
+</SiddhiExtensionConfiguration>

src/main/resources/p2.inf

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+instructions.configure = \
+org.eclipse.equinox.p2.touchpoint.natives.copy(source:${installFolder}/../features/org.wso2.extension.siddhi.device_${feature.version}/conf/siddhi-integration.xml,target:${installFolder}/../../conf/siddhi-integration.xml,overwrite:true);\