Issue #118: upgrade to checkstyle 8.1

Author: romani

checkstyle-sonar-plugin/src/main/resources/org/sonar/l10n/checkstyle.properties

@@ -499,7 +499,6 @@ rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.blocks.EmptyCatchBlockChe
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.blocks.EmptyCatchBlockCheck.param.commentFormat=Format of comment.
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck.name=Import Control
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck.param.file=name of the file containing the import control configuration
-rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck.param.url=URL of the file containing the import control configuration
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.imports.ImportControlCheck.param.path=Regular expression of file paths to which this check should apply.
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.indentation.CommentsIndentationCheck.name=Comments Indentation
 rule.checkstyle.com.puppycrawl.tools.checkstyle.checks.indentation.CommentsIndentationCheck.param.tokens=tokens to check

checkstyle-sonar-plugin/src/main/resources/org/sonar/plugins/checkstyle/rules.xml

@@ -2002,8 +2002,6 @@
     <configKey><![CDATA[Checker/TreeWalker/ImportControl]]></configKey>
     <param key="file" type="STRING">
     </param>
-    <param key="url" type="STRING">
-    </param>
     <param key="path" type="REGULAR_EXPRESSION">
       <defaultValue>.*</defaultValue>
     </param>

checkstyle-sonar-plugin/test-resources/checkstyle-conf.xml

@@ -2,11 +2,11 @@
 <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
 <!-- Generated by Sonar -->
 <module name="Checker">
-    <module name="SuppressionCommentFilter"/>
     <module name="JavadocPackage">
         <property name="severity" value="warning"/>
     </module>
     <module name="TreeWalker">
+        <module name="SuppressionCommentFilter"/>
         <module name="FileContentsHolder"/>
         <module name="EmptyStatement">
             <property name="severity" value="info"/>

pom.xml

@@ -85,7 +85,7 @@
   </ciManagement>
 
   <properties>
-    <checkstyle.version>8.0</checkstyle.version>
+    <checkstyle.version>8.1</checkstyle.version>
     <sonar.version>5.6.6</sonar.version>
     <sonar-java.version>3.7</sonar-java.version>
     <java.version>1.8</java.version>