Added rat maven plugin support to chainsaw, component, extras, receivers and zeroconf

Updated all files reported by rat as missing ASL Headers..now all companions and Chainsaw pass mvn rat:check (log4j core still reports a few errors (in tests/output)).

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/companions/component/trunk@956195 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 9bcff09..d8d3a99 100644
--- a/pom.xml
+++ b/pom.xml
@@ -78,6 +78,10 @@
 <build>
     <plugins>
       <plugin>
+        <groupId>org.apache.rat</groupId>
+        <artifactId>apache-rat-plugin</artifactId>
+      </plugin>
+      <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
           <workingDirectory>target</workingDirectory>