LogsDownloaderWorker: Import cleanup.
LogsDownloaderWorker: Adding method getOrRenewFtpDownloader(...) to place in one spot test and renew of ftp downloader.
LogsDownloaderWorker: On log list update, host for LogFileInfo is also updated.
LogsDownloaderWorker: Better test for witch host to ask for file deletion.
LogsDownloaderWorker: Waiting for download stop also looks for QUEUE state in adition to the WORKING.
LogsDownloaderWorker: Cleanup.