[Jenkins] Clear build queue and cancel all builds

gistfile1.groovy

def q = Jenkins.instance.queue
q.items.findAll { q.cancel(it.task) }
//q.items.findAll { it.task.name.startsWith('my') }.each { q.cancel(it.task) }

def items = Jenkins.instance.items
items.each { job ->
  job.builds.findAll { build -> build.building }.each { run ->
    println("Aborting: " + job.name)
    run.doStop();
  }
}

println("Done")