Added Lockable Resources Plugin

Let's add support for lockable-resources plugin, for details, see https://wiki.jenkins-ci.org/display/JENKINS/Lockable+Resources+Plugin 

Thanks
looks like a codenarc violation here because of consecutive blank lines https://jenkins.ci.cloudbees.com/job/plugins/job/job-dsl-plugin/ws/job-dsl-core/build/reports/codenarc/main.html