Fix ContainerExecProc joinWithTimeout

[cronik]

This change updates the ContainerExecProc#kill method to force the finished countdown latch to decrement. It has been observed in some high load clusters where the joinWithTimeout timeout is reached but the proc continues to be blocked.

When joinWithTimeout is called, the kill method is called if the task does not complete in time.

https://github.com/jenkinsci/jenkins/blob/368f1ccbc967a85c0ff801f3729cb77a269afd41/core/src/main/java/hudson/Proc.java#L165

But if kill fails to trigger the finished countdown latch then the join method will continue to wait indefinitely.

kubernetes-plugin/src/main/java/org/csanchez/jenkins/plugins/kubernetes/pipeline/ContainerExecProc.java

Line 100 in 676ab93

finished.await();

By forcing finished.countDown() after close the join should be unblocked even if the ctl-c command didn't trigger the exec listener. countDown is a no-op if the latch is already zero.

Testing done

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• Ensure that the pull request title represents the desired changelog entry
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[cronik]

Thread dump of deadlock

"org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution [#536]" Id=362583 Group=main WAITING on java.util.concurrent.CountDownLatch$Sync@3621b128
    at [[email protected]](mailto:[email protected])/jdk.internal.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.CountDownLatch$Sync@3621b128
    at [[email protected]](mailto:[email protected])/java.util.concurrent.locks.LockSupport.park(LockSupport.java:211)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:715)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1047)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.CountDownLatch.await(CountDownLatch.java:230)
    at PluginClassLoader for kubernetes//org.csanchez.jenkins.plugins.kubernetes.pipeline.ContainerExecProc.join(ContainerExecProc.java:100)
    at hudson.Proc.joinWithTimeout(Proc.java:172)
    at PluginClassLoader for kubernetes//org.csanchez.jenkins.plugins.kubernetes.pipeline.EphemeralContainerStepExecution.setDefaultRunAsUser(EphemeralContainerStepExecution.java:428)
    at PluginClassLoader for kubernetes//org.csanchez.jenkins.plugins.kubernetes.pipeline.EphemeralContainerStepExecution.startEphemeralContainer(EphemeralContainerStepExecution.java:184)
    at PluginClassLoader for kubernetes//org.csanchez.jenkins.plugins.kubernetes.pipeline.EphemeralContainerStepExecution.startEphemeralContainerWithRetry(EphemeralContainerStepExecution.java:112)
    at PluginClassLoader for kubernetes//org.csanchez.jenkins.plugins.kubernetes.pipeline.EphemeralContainerStepExecution$$Lambda$2125/0x0000000801d38b50.run(Unknown Source)
    at PluginClassLoader for workflow-step-api//org.jenkinsci.plugins.workflow.steps.GeneralNonBlockingStepExecution.lambda$run$0(GeneralNonBlockingStepExecution.java:77)
    at PluginClassLoader for workflow-step-api//org.jenkinsci.plugins.workflow.steps.GeneralNonBlockingStepExecution$$Lambda$2121/0x00000008013ae3b0.run(Unknown Source)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
    at [[email protected]](mailto:[email protected])/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
    at [[email protected]](mailto:[email protected])/java.lang.Thread.run(Thread.java:840)

    Number of locked synchronizers = 1
    - java.util.concurrent.ThreadPoolExecutor$Worker@53a0676c