Fix for import crash when arbitrary queue length of GenericMultiThreadedImporter.importTP exceeded

In org.nuxeo.ecm.platform.importer.base.GenericThreadedImportTask#recursiveCreateDocumentFromNode, this call:

GenericMultiThreadedImporter.getExecutor().execute(task);

will crash the importer if the queue size of the ThreadPoolExecutor is > 100.

There is an arbitrary limit placed on the importTP of 100.

importTP = new ThreadPoolExecutor(nbThreads, nbThreads, 500L,TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(100),new NamedThreadFactory("Nuxeo-Importer-"));

We have fixed this problem during a large import, by removing this arbitrary limitation (use standard constructor where queue length is limited to Integer.MAX). If the queue length must be kept to a small size, there are other alternatives. Perhaps if it must be kept, it should be passed as another parameter 'maxQueueLength'.