Fix apex-pdp packaging issue

Fix apex-pdp packaging issue and add SampleDomain examples to try out
how apex-pdp works.

Change-Id: I4018b0902d06345e86ddbef80100e63232cee49d
Issue-ID: POLICY-861
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>
diff --git a/pom.xml b/pom.xml
index a07dc79..b983c6c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -108,6 +108,7 @@
                                                 <versionRange>[1.6.0,)</versionRange>
                                                 <goals>
                                                     <goal>java</goal>
+                                                    <goal>exec</goal>
                                                 </goals>
                                             </pluginExecutionFilter>
                                             <action>