Adding more examples to apex-pdp

- Adding more examples (DecisionMaker, Periodic & ONAPvCPE) to apex-pdp.
- Fixed CORS issue in plugin-event-carrier-restserver module.
Added a ContainerResponseFilter to intercept every request/response coming to
REST server and add the required headers to support CORS.

Change-Id: Ic3e36c683f2a78992ce1417d2c00233b34066f2f
Issue-ID: POLICY-861
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>
diff --git a/examples/examples-onap-vcpe/pom.xml b/examples/examples-onap-vcpe/pom.xml
new file mode 100644
index 0000000..2fa5315
--- /dev/null
+++ b/examples/examples-onap-vcpe/pom.xml
@@ -0,0 +1,85 @@
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2018 Ericsson. All rights reserved.
+  ================================================================================
+  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.
+
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.onap.policy.apex-pdp.examples</groupId>
+        <artifactId>examples</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>examples-onap-vcpe</artifactId>
+    <name>${project.artifactId}</name>
+    <description>Specific code for the APEX ONAP vCPE Example</description>
+
+    <properties>
+        <policymodel.name>ONAPvCPEPolicyModel</policymodel.name>
+        <apex-domains-onap-vcpe-dir>${project.basedir}/src</apex-domains-onap-vcpe-dir>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.auth</groupId>
+            <artifactId>cli-editor</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.services</groupId>
+            <artifactId>services-engine</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish.jersey.containers</groupId>
+            <artifactId>jersey-container-grizzly2-http</artifactId>
+            <version>${version.jersey}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <!-- Generate the APEX Policy JSON from the APEX CLI command -->
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>generate-policy</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>org.onap.policy.apex.auth.clieditor.ApexCLIEditorMain</mainClass>
+                            <classpathScope>compile</classpathScope>
+                            <arguments>
+                                <argument>--command-file=${project.basedir}/src/main/resources/policy/${policymodel.name}.apex</argument>
+                                <argument>--output-model-file=${project.build.directory}/classes/${policymodel.name}.json</argument>
+                                <argument>--log-file=${project.build.directory}/${policymodel.name}_policygeneration.log</argument>
+                                <argument>--working-dir=${project.basedir}</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file