[MDEP-472] Upgrade to maven-plugins parent version 27
 - Added configuration to append the rat configurations.


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1640049 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 350c02e..21fdf29 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <artifactId>maven-plugins</artifactId>
     <groupId>org.apache.maven.plugins</groupId>
-    <version>26</version>
+    <version>27</version>
     <relativePath>../maven-plugins/pom.xml</relativePath>
   </parent>
 
@@ -266,7 +266,7 @@
           <groupId>org.apache.rat</groupId>
           <artifactId>apache-rat-plugin</artifactId>
           <configuration>
-            <excludes>
+            <excludes combine.children="append">
               <!--
                 These files contain results for integration tests which can't contain license header
                 otherwise the IT's will fail.