Fix parent.relativePath in protocol pom.xml

Change-Id: Iaa3a31a4eb9043667f1e156cc4478bb37cf1ad8c
diff --git a/protocols/openflow/pom.xml b/protocols/openflow/pom.xml
index 3672e46..5a136a1 100644
--- a/protocols/openflow/pom.xml
+++ b/protocols/openflow/pom.xml
@@ -21,7 +21,7 @@
 
     <parent>
         <groupId>org.onosproject</groupId>
-        <artifactId>onos</artifactId>
+        <artifactId>onos-protocols</artifactId>
         <version>1.4.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>