Put all checkstyle files together

pom.xml

@@ -156,7 +156,9 @@
     <commons.encoding>UTF-8</commons.encoding>
 
     <checkstyle.version>3.1.2</checkstyle.version>
-    <checkstyle.header.file>${basedir}/LICENSE-header.txt</checkstyle.header.file>
+    <checkstyle.header.file>${basedir}/src/site/resources/checkstyle/checkstyle-header.txt</checkstyle.header.file>
+    <checkstyle.config.file>${basedir}/src/site/resources/checkstyle/checkstyle.xml</checkstyle.config.file>
+    <checkstyle.suppress.file>${basedir}/src/site/resources/checkstyle/checkstyle-suppressions.xml</checkstyle.suppress.file>
     <checkstyle.resourceExcludes>LICENSE.txt, NOTICE.txt, **/maven-archiver/pom.properties</checkstyle.resourceExcludes>
 
     <commons.pmd.version>3.14.0</commons.pmd.version>
@@ -203,9 +205,9 @@
         <artifactId>maven-checkstyle-plugin</artifactId>
         <version>${checkstyle.version}</version>
         <configuration>
-          <configLocation>${basedir}/checkstyle.xml</configLocation>
+          <configLocation>${checkstyle.config.file}</configLocation>
           <enableRulesSummary>false</enableRulesSummary>
-          <suppressionsLocation>${basedir}/src/site/resources/checkstyle/checkstyle-suppressions.xml</suppressionsLocation>
+          <suppressionsLocation>${checkstyle.suppress.file}</suppressionsLocation>
         </configuration>
       </plugin>
       <plugin>
@@ -274,9 +276,9 @@
         <artifactId>maven-checkstyle-plugin</artifactId>
         <version>${checkstyle.version}</version>
         <configuration>
-          <configLocation>${basedir}/checkstyle.xml</configLocation>
+          <configLocation>${checkstyle.config.file}</configLocation>
           <enableRulesSummary>false</enableRulesSummary>
-          <suppressionsLocation>${basedir}/src/site/resources/checkstyle/checkstyle-suppressions.xml</suppressionsLocation>
+          <suppressionsLocation>${checkstyle.suppress.file}</suppressionsLocation>
         </configuration>
         <!-- We need to specify reportSets because 2.9.1 creates two reports -->
         <reportSets>