PR#3756: Add more logging to rmtree
    
    Merges #3756
    https://pagure.io/koji/pull-request/3756
    
    Fixes: #3815
    https://pagure.io/koji/issue/3815
    Additional rmtree logging
    
    Relates: #3755
    https://pagure.io/koji/issue/3755
    koji-gc occasionally gets Directory not empty fault on delete