checkstyle-tester: excludes for jdk8/9 to make test pass on CI
checkstyle-tester: excludes for jdk8/9 to make test pass on CI

checkstyle/contribution,Vladlis/contribution,rnveach/contribution,rnveach/contribution,rnveach/contribution,MEZk/contribution,checkstyle/contribution,MEZk/contribution,MEZk/contribution,Vladlis/contribution,checkstyle/contribution,Vladlis/contribution,MEZk/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,Vladlis/contribution,rnveach/contribution,checkstyle/contribution,Vladlis/contribution,rnveach/contribution,MEZk/contribution,MEZk/contribution,Vladlis/contribution,checkstyle/contribution