Fix parent relativePath warnings on parent POM

Adding an empty relativePath element tot he parent removes the
warning about 'parent.relativePath' on the parent build.

Issue-ID: POLICY-954
Change-Id: I9b0b0cb4da93c7f87142ae2e4bda7c69b1b69cca
Signed-off-by: liamfallon <liam.fallon@ericsson.com>
diff --git a/pom.xml b/pom.xml
index 6110955..d143e19 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,6 +24,7 @@
         <groupId>org.onap.oparent</groupId>
         <artifactId>oparent</artifactId>
         <version>1.2.0</version>
+        <relativePath/> 
     </parent>
     <groupId>org.onap.policy.parent</groupId>
     <artifactId>policy-parent</artifactId>