cifs-utils: add latest cifs-upcall cleanup patches
    
    Add a number of cleanup patches to make cifs.upcall more efficient.
    Note that these do have the potential to break some configurations
    if they depend on the directory-scanning behavior of the original
    patches, but hopefully no one is actually relying on that.
    
    Signed-off-by: Jeff Layton <jlayton@redhat.com>