Start the crawl later on the second crawler.
    
    Even with rsync as crawl method some hosts are taking a very long time
    to be crawled. The network connection with rsync is only open for a
    short time, but with both crawlers reading and writing from the database
    it takes a very long time until the status of all directories is
    updated. Therefore this patch introduces a 3 hour delay of the crawl
    on the second crawler. This could also be solved with two different
    cron.d files; one for each crawler.