Removed unrequired dependencies of runtime.

Change-Id: I994346b5803844fe414b1f9cad70cf345faf0789
diff --git a/serializers/xml/pom.xml b/serializers/xml/pom.xml
index fc139e0..164e49b 100644
--- a/serializers/xml/pom.xml
+++ b/serializers/xml/pom.xml
@@ -80,13 +80,11 @@
                             <goal>run</goal>
                         </goals>
                         <configuration>
-                            <tasks>
+                            <target>
                                 <delete>
-                                    <fileset
-                                            dir="${project.build.outputDirectory}/org/onosproject/yang/gen"
-                                            includes="**/*"/>
+                                    <fileset dir="${project.build.outputDirectory}/org/onosproject/yang/gen" includes="**/*"/>
                                 </delete>
-                            </tasks>
+                            </target>
                         </configuration>
                     </execution>
                 </executions>