Merge remote-tracking branch 'upstream/master'
additional assertions in test cases to check if links are available and implemented test cases for issue 21723 (problem exists in checkstyle, pmd and findbugs)
reformated and changed
Merge branch 'link_checks' of https://github.com/jenkins-acceptance-test-group/acceptance-test-harness
[JENKINS-21723] Mark test case that exposes the bug as ignored.
Merge branch 'master' of github.com:jenkinsci/acceptance-test-harness