[infinispan-issues] [JBoss JIRA] (ISPN-8106) Enable the unused imports checkstyle rule

Enable the unused imports checkstyle rule ----------------------------------------- Key: ISPN-8106 URL: https://issues.jboss.org/browse/ISPN-8106 Project: Infinispan Issue Type: Task Components: Build process Affects Versions: 9.1.0.Final Reporter: Dan Berindei Assignee: Dan Berindei Priority: Minor Fix For: 9.1.1.Final Checkstyle 8.1 finally fixes the various problems with the unused imports check: https://github.com/checkstyle/checkstyle/issues/2840 https://github.com/checkstyle/checkstyle/issues/4606