HV-1476 Updating checkstyle version and config

Author: marko-bekhta

build-config/src/main/resources/checkstyle.xml

@@ -5,8 +5,8 @@
   ~ License: Apache License, Version 2.0
   ~ See the license.txt file in the root directory or <http://www.apache.org/licenses/LICENSE-2.0>.
   -->
-<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
-        "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+        "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
 
 <module name="Checker">
 
@@ -131,18 +131,14 @@
             <property name="option" value="space"/>
         </module>
 
-        <!-- Required to get SuppressionCommentFilter to work -->
-        <module name="FileContentsHolder" />
-
+        <module name="SuppressionCommentFilter" />
     </module>
 
     <module name="RegexpSingleline">
         <property name="format" value="\s+$" />
         <property name="message" value="White spaces at the end of line" />
     </module>
 
-    <module name="SuppressionCommentFilter" />
-
     <module name="SuppressionFilter">
         <property name="file" value="/suppressions.xml" />
     </module>

pom.xml

@@ -165,7 +165,7 @@
         <apache.karaf.version>4.1.1</apache.karaf.version>
         <osgi-core.version>6.0.0</osgi-core.version>
 
-        <puppycrawl.checkstyle.version>7.6</puppycrawl.checkstyle.version>
+        <puppycrawl.checkstyle.version>8.1</puppycrawl.checkstyle.version>
 
         <groovy.version>2.4.12</groovy.version>