dcache-bulk: handle InterruptedException in DirListTask

Motivation:

https://rb.dcache.org/r/14041/
`master@2acfaf8`
introduced multithreaded concurrent listing
using a `DirListTask`.

During cancellation, this stack trace may
occur repeatedly:

```
pool-13-thread-24] [] Uncaught exception in thread pool-13-thread-24java.lang.InterruptedException: null
	at org.dcache.services.bulk.job.AbstractRequestContainerJob.checkForRequestCancellation(AbstractRequestContainerJob.java:396)
	at org.dcache.services.bulk.job.RequestContainerJob.perform(RequestContainerJob.java:257)
	at org.dcache.services.bulk.job.RequestContainerJob.handleFileTarget(RequestContainerJob.java:191)
	at org.dcache.services.bulk.job.AbstractRequestContainerJob$1.doList(AbstractRequestContainerJob.java:442)
	at org.dcache.services.bulk.job.AbstractRequestContainerJob$DirListTask.run(AbstractRequestContainerJob.java:146)
	at org.dcache.util.BoundedExecutor$Worker.run(BoundedExecutor.java:247)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
```

This is due to the fact that the InterruptedException
generated by the cancellation is not handled separately
in the wrapped `DirListTask`.

Modification:

Treat the InterruptedException as a special case, as it
should be.

Result:

No more cluttering of the log file when jobs with
ongoing listing activity are cancelled.

Target: master
Patch: https://rb.dcache.org/r/14091/
Requires-notes: no (unreleased changes)
Acked-by: Tigran

modules/dcache-bulk/src/main/java/org/dcache/services/bulk/job/AbstractRequestContainerJob.java

@@ -144,6 +144,10 @@ abstract class DirListTask implements Runnable {
         public void run() {
             try {
                 doList();
+            } catch (InterruptedException e) {
+                containerState = ContainerState.STOP;
+                target.setErrorObject(e);
+                update(CANCELLED);
             } catch (Throwable e) {
                 errorHandler.accept(e);
                 Throwables.throwIfUnchecked(e);